import std.stdio, std.string, std.conv, std.array, std.algorithm;
import std.uni, std.range, std.math, std.container, std.datetime;
import core.bitop, std.typetuple, std.typecons;

immutable long MOD = 1_000_000_007;
alias tie = TypeTuple;

void main(){
    auto w1 = readln.chomp;
    auto w2 = readln.chomp;
    auto week = w1 ~ w2;
    int ans, tmp;

    foreach(c ; week){
        if(c == 'o'){
            tmp += 1;
        } else {
            ans = max(ans, tmp);
            tmp = 0;
        }
    }

    ans = max(ans, tmp);

    writeln(ans);
}


void readVars(T...)(auto ref T args){
    auto line = readln.split;
    foreach(ref arg ; args){
        arg = line.front.to!(typeof(arg));
        line.popFront;
    }
    if(!line.empty){
        throw new Exception("args num < input num");
    }
}