#include<bits/stdc++.h>
#include<string>
#include<algorithm>
using namespace std;
int main(){ 
    string s,s1,s2;
    char c;
    while(cin>>c,c!=',')s=s+c;
    while(cin>>c,c!=',')s1=s1+c;
    while(cin>>c)s2=s2+c;

    if(s.size()<s1.size()||s.size()<s2.size())puts("-1");
    else{
    int l=0;
    while(l+s1.size()<=s.size()){//
    int k=0;
    while(k<s1.size())
    {//k是从s1开始的0-最后的不同位数来判断 
        if(s[l+k]!=s1[k])break;//l从k开始往后的0-最后 
        k++;
    }
        if(k==s1.size())break;//l也是s1的从0-最后；考虑范围 
        l++; 
    }
    int r=s.size()-s2.size();//！！从最后一位来看 
    while(r>=0){
        int k=0;
        while(k<s2.size()){
            if(s[r+k]!=s2[k])break;
            k++;
        }if(k==s2.size())break;
        r--;//从最后来看的s2 
    }
        l+=s1.size()-1; 
        if(l>=r)puts("-1");
        else cout<<r-l-1;
    }
    return 0;
}