#include <stdio.h>
int main(){
    //input
    char day[14+1];
    char l1[7+1];
    char l2[7+1];
    scanf("%s",l1);
    scanf("%s",l2);
    for (int i = 0;i < 14;i++){
        if (i < 7){
            day[i] = l1[i];
        }else{
            day[i] = l2[i-7];
        }
    }

    //count continuous holiday
    int maxCount = 0;
    int tmpCount = 0;
    for (int i = 0;i < 14;i++){
        if (day[i] == 'o'){
            tmpCount++;
        }else{
            tmpCount = 0;
        }

        if (maxCount < tmpCount){
            maxCount = tmpCount;
        }
    }


    //output
    printf("%d\n",maxCount);
    return 0;
}