#include<bits/stdc++.h>
using namespace std;
int main() {
string str1, str2;
getline (cin,str1);
getline(cin, str2);
if (str1.find(str2) != string::npos) {
str1.replace(str1.find(str2), str2.length(), "");
cout<<str1<<endl;
}
}
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