#include <stdio.h>
#include <string.h>

int silentSearch(unsigned char *s){
	int i, len = 0, res = 0;
	for(i = 0; i <= strlen(s); i++){
		if(s[i] == 0xe2 && s[i+1] == 0x80 && s[i+2] == 0xa6){
			len++;
			i+=2;
		}else {
			if(res < len) res = len;
			len = 0;
		}
	}
	return res;
	
}
int main(){
	unsigned char S[300] = {'\0'};
	scanf("%s", S);
	
	printf("%d\n",silentSearch(S));
	return 0;
}