#include <bits/stdc++.h>
using namespace std;
char a[1001],b[1001],s[1001];
int change[30];
int v[30]={0};
int main()
{
	//freopen("enc.in","r",stdin);
	//freopen("enc.out","w",stdout);
	int i;
	scanf("%s %s %s",b,a,s);
	memset(change,-1,sizeof(change));
	for(i=0;i<strlen(a);i++)
	{
		if(change[a[i]-'a']==-1)
		{
			if(!v[b[i]-'a'])
				change[a[i]-'a']=b[i]-'a',v[b[i]-'a']=1;
			else
			{
				cout<<"ERROR";
				return 0;
			}
		}
		else if(change[a[i]-'a']!=b[i]-'a')
		{
			cout<<"ERROR";
			return 0;
		}
	}
	for(i=0;i<strlen(s);i++)
		if(change[s[i]-'a']==-1)
		{
			cout<<"ERROR";
			return 0;
		}
	for(i=0;i<strlen(s);i++)
		printf("%c",change[s[i]-'a']+'a');
	return 0;
}