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

int main(){
    int i, cnt = 0, max;
    char week1[8], week2[8];
    int hol[14] = {0};

    scanf("%s\n", week1);
    scanf("%s\n", week2);
    for(i = 0; i < 7; i++){
        if(week1[i] == 'o'){
            hol[cnt]++;
        }else{
            cnt++;
        }
    }
    for(i = 0; i < 7; i++){
        if(week2[i] == 'o'){
            hol[cnt]++;
        }else{
            cnt++;
        }
    }
    max = hol[0];
    for(i = 0; i < 14; i++){
        if(max <= hol[i]){
            max = hol[i];
        }
    }
    printf("%d\n", max);

    return 0;
}