#include <iostream>
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;
if(s.find(s1) != -1 && s.find(s2) != -1 && s.find(s1) + s1.size() <= s.rfind(s2))
cout << s.rfind(s2) - s.find(s1) - s1.size() << endl;
else cout << -1;
return 0;
}
看了那么多题解觉得还是自己的更简洁易懂