#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include <malloc.h>
#include <string.h>
#define FL __FILE__,__LINE__
#define PD printf("."); fflush(stdout)
#define tz(x) if(x){printf("\n%s:%d:5:Fail: %s is %d not zero.",FL,#x,x);}else PD;
#define tde(x,y) if(x!=y){printf("\n%s:%d:6:Fail: %s is %d not %d.",FL,#x,x,y);}else PD;
#define tse(x,y) if(strcmp(x,y)){printf("\n%s:%d:6:Fail: %s is %s not %s",FL,#x,x,y);}else PD;

int *parseline(char *s){
	int *ret=calloc(strlen(s)+1,sizeof(int));
	int count =0;
	while(s!=NULL && *s!= '\0'){
		char *n=strsep(&s," ");
		if(n!=NULL){
			ret[count]=atoi(n);
			if(atoi(n)<1)abort();
			count++;
		}
	}
	ret[count]=0;
	return ret;
}
int issafe(int *data){
	if(data == NULL) return 0;
	int dir=0;
	for(int i=0;data[i]!=0;i++){
		if(i>0){
			if (abs(data[i]-data[i-1])>3 || data[i]==data[i-1]){
				//printf(" unsafe data %d %d\n",data[i-1],data[i]);
				return 0;
			}
			if(dir){
				if(dir<0 && data[i]>data[i-1]){
					//printf(" bad dir %d %d\n",data[i-1],data[i]);
					return 0;
				}else if(dir>0 && data[i]<data[i-1]){
					//printf(" bad dir %d %d\n",data[i-1],data[i]);
					return 0;
				}
			}else if(data[i]>data[i-1]){
				dir=1;
			}else{
				dir=-1;
			}
		}
	}
	return 1;
}
int *adup(int *a){
	int len=0;
	for(len=0;a[len]!=0;len++);
	len++;
	int *b=calloc(len,sizeof(int));
	for(int i=0; i<len;i++)b[i]=a[i];
	return b;
}
int *del(int *data,int index){
	if(data==NULL)abort();
	if(data[index]==0)abort();
	int len=0;
	for(int i=index;data[i+1]!=0;i++){
		data[i]=data[i+1];
		len=i;
	}
	data[len+1]=0;
	return data;
}
void printdata(int *data){
	for(int i=0;data[i]!=0;i++){
		printf("%d ",data[i]);
	}
	printf("\n");
}
int issafepdamp(int *data) {
	if(issafe(data)) return 1;
	for(int i=0;data[i+1]!=0;i++){
		int * ddata = del(adup(data),i);
		//printf("trying: "); printdata(ddata);
		if(issafe(ddata)) {
			free(ddata);
			return 1;
		}else{
			free(ddata);
		}
	}
	printf("unsafe: "); printdata(data);
	return 0;
}
void test(void){
	char *testcases[] = {
		"7 6 4 2 1",
		"1 2 7 8 9",
		"9 7 6 2 1",
		"1 3 2 4 5",
		"8 6 4 4 1",
		"1 3 6 7 9"
	};
	int testa[] = {1,0,0,0,0,1};
	int testb[] = {1,0,0,1,1,1};
	int count = 0;
	char *s2=strdup(testcases[0]);
	int *d=parseline(s2);
	tde(d[4],1);
	int *dd=adup(d);
	int *data;
	for(int i=0;dd[i]!=0;i++)tde(dd[i],d[i]);
	del(dd,2);
	for(int i=0;i<2;i++)tde(dd[i],d[i]);
	for(int i=2;dd[i+1]!=0;i++)tde(dd[i],d[i+1]);
	free(d); free(s2);free(dd);
	for(unsigned int i=0; i<sizeof(testcases)/sizeof(char *); i++){
		int *data;
		char *s=strdup(testcases[i]);
		int safe=issafe(data=parseline(s));
		tde(safe,testa[i]);
		count+=safe;
		free(data);
		free(s);
	}
	tde(count,2);
	count = 0;
	for(unsigned int i=0; i<sizeof(testcases)/sizeof(char *); i++){
		char *s=strdup(testcases[i]);
		int safe=issafepdamp(data=parseline(s));
		tde(safe,testb[i]);
		count+=safe;
		free(data);
		free(s);
	}
	tde(count,4);
	/*char *dampsafe=strdup("9 11 9 7 6 3 5 1");
	data=parseline(dampsafe);
	tde(issafepdamp(data),1);
	free(dampsafe);
	free(data);
	char *shortsafe=strdup("11 9 7 6 3 5 1");
	data=parseline(shortsafe);
	tde(issafe(data),1);
	free(shortsafe);
	free(data);
	tde(1,1);
	*/

}
int main() {
	test();
	int count = 0;
	int countdamp = 0;
	char buf[1024];
	while(!feof(stdin)){
		int *data=NULL;
		fgets(buf,1024,stdin);
		if(strlen(buf)>1){
			data=parseline(buf);
			count+=(issafe(data));
			countdamp+=(issafepdamp(data));
			free(data);
		}
	}
	printf("\nAnswer: %d\n",count);
	printf("\nAnswer2: %d\n",countdamp);
	return 0;
}