#include <stdio.h>

int main() {
    //실습1//
    /*printf("Hello world!\n");*/

    //실습2//
   /* printf("Hello");
    printf("Hello");
    printf("Hello");*/

    //실습3//
    /*printf("hellohello");*/

    //실습4//
    /*printf("hellohello\n");
    printf("12345678\n");*/

    //실습5//
    printf("hello\n12345678\n");
    return 0;
}