#include <stdio.h>
#include <string.h> //文字列の連結に必要なもの
#define MaxDay (14) //定数

void main(void){
	
	int longestDay = 0;
	char firstweek[100] = "a";
	scanf("%s\n",firstweek);
	char secondweek[100] = "b";
	scanf("%s\n",secondweek);
	char *goldenWeek;
	strcat(firstweek, secondweek);
	int count = 0;
	for(int i = 0 ; i < MaxDay ; i++){
		if(firstweek[i] == 'o'){
			count++;
		}else{
			if(longestDay > count){
				longestDay = count;
			}
			count = 0;
		}
	}
	printf("%d\n",longestDay);
}