#include <stdio.h>
#include <string.h>

void concatenate(char *string1, char *string2) {

    strcat(string1, " ");
    strcat(string1, string2);
}

main() {
    char *x, *y;

    x = (char *)malloc(sizeof(char)*10);
    y = (char *)malloc(sizeof(char)*20);
    
    scanf("%s", x);
    scanf("%s", y);
    concatenate(x,y);

    printf("x = %s\n", x);
    printf("y = %s\n", y);
}