#include <stdio.h>
#include<string.h>
int main()

char num1[10],num2[10];
int i,j,count;
scanf("%s",num1);
scanf("%s", num2);
for (i = 0;i< strlen(num1);i++){
    for (j=0; j<strlen(num2);j++){
        if(num1[i]==num2[j]){
            printf("%c",num1[i]);
            count ++;
            break;
        }
    }
    
}if(count == 0){
    printf("No common elements");
    return 0;
}
return 0;
}