#include<iostream>
#include<cstring>

using namespace std;

int main()
{
    string str, a, b;
    string line;
    cin >> line;

    int k = 0;
    while(line[k] != ',') str += line[k ++ ]; 
    k ++ ;
    while(line[k] != ',') a += line[k ++ ]; 
    k ++ ;
    while(k < line.size()) b += line[k ++ ]; 


    int l = 0, r = 0;
    for (int i = 0; i < str.size(); i ++ )  // 找前面第一个符合的
    {
        if (str.substr(i, a.size()) == a )
        {
            l = i + a.size();
            break;
        }
    }
    for (int i = str.size() - b.size(); i >= 0; i -- ) // 倒着找后面最后一个符合的
    {
        if (str.substr(i, b.size()) == b)
        {
            r = i;
            break;
        }
    }

    if (l > r || l == 0 || r == 0) cout << "-1" << endl;
    else cout << r - l << endl;
    return 0;
}