#include <stdio.h>
#include <string.h>
int main(void) {
    unsigned char  str[128*3];
    unsigned char    *p;
    unsigned char    *pr;
    int     cnt = 0;
    int     max = 0;
    scanf("%s", str);
    p = str;
    while( *p != '\0' ) {
        if( ( *p == 0xe2 ) && ( *(p+1) == 0x80 ) && ( *(p+2) == 0xa6 ) ) {
            cnt++;
            if( max < cnt ) max = cnt;
            p += 3;
        } else {
            cnt = 0;
            p++;
        }
    }
    printf("%d\n", max);
	return 0;
}