#include<bits/stdc++.h>
using namespace std;
int pre[1110000], p[1110000];
string s1, s2;
int main()
{
    cin>>s1>>s2;
    int len1=s1.length();
    int len2=s2.length();
    s1=' '+s1;
    s2=' '+s2;
    memset(pre,0,sizeof(pre));
    for(int i=1,j=pre[i];i<len2;i++,j=pre[i])
	{
        while(j>0&&s2[i+1]!=s2[j+1])j=pre[j];
        if(s2[i+1]==s2[j+1])pre[i+1]=j+1;
    }

    for(int i=0,j=0;i<len1;i++,j=p[i])
	{
        while(j>0&&s1[i+1]!=s2[j+1]) j=pre[j];
        if(s1[i+1]==s2[j+1])j=j+1;
        p[i+1]=j;
        if(j==len2) 
		{
			s1.erase(i+1-len2+1,len2);
			len1-=len2;
			i=i+1-len2+1-1-1;
		}
    }
    s1.erase(0,1);
    cout<<s1<<endl;
    return 0;
}