#include <stdio.h>
#include <string.h>
int main(void)
{
    char str1[40];
    char str2[40];
    char str3[40];
    char work[200];

    strcpy(str1, "Let's");
    strcpy(str2, "study");
    strcpy(str3, "programming.");
    printf("%s %s %s\n", str1, str2, str3);

    strcat(work, str1);
    strcat(work, " ");
    strcat(work, str2);
    strcat(work, " ");
    strcat(work, str3);
    printf("%s\n", work);

    return 0;
}