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#include<stdio.h>
#include<string.h>
void main()
{
	int n1,n2,i,j;
	char str1[20],str2[20];
	scanf("%s%s",str1,str2);
	n1=strlen(str1);
	n2=strlen(str2);
	for(i=0;i<n1;i++){
		for(j=0;j<n2;j++){
			if(str1[i]==str2[j])
			   printf("%c",str1[i]);
		}
	}
}