#include<bits/stdc++.h>
using namespace std;
int main(){
    string s1,s2;
    cin>>s1>>s2;
    int p=s1.find(s2);
    while(p!=-1){
        s1.erase(p,1);
        p=s1.find(s2);
    }
    cout <<s1;
    return 0;
}
/**************************************************************
	Problem: 1131
	User: luyanchen
	Language: C++
	Result: Accepted
	Time:6 ms
	Memory:2076 kb
****************************************************************/