#include <stdio.h>

#define SIZE 10

int main() {
    char numbs[SIZE] = {0} ;
    int x = 0;
    int input = 0;
    int count = 0;
    
    while(input != NULL){
	printf('2');
    	numbs[count] = input;
	printf("%d",numbs[count]);
	count++;
    }
    printf('3');

    return 0;
}