#include <iostream>
#include <string>

using namespace std;

int main(){
    string s, s1, s2;
    char c;
    while (cin >> c, c != ',') s += c;
    while (cin >> c, c != ',') s1 += c;
    while (cin >> c) s2 += c;

    int f=s.find(s1);
    int l=s.rfind(s2)-s1.size();
    if(l-f<0 || f<0 || l<0) cout << "-1";
    else cout << l-f;
    return 0;
}