#include <stdio.h>

int main() {
///실습1//
    /*printf("조경찬 선생님의 정보수업");*/
    
    //실습2//
    /*printf("Hellow, World");
    printf("안녕하세요.");
    printf("1234567890");
    printf("abcdefg");*/

    //실습3//
   /*printf("Hellow, World안녕하세요. 1234567890abcdefg");*/

     //실습4//
    /*printf("Hellow, World\n");
    printf("안녕하세요.\n");
    printf("1234567890\n");
    printf("abcdefg\n");*/

    //실습5//
   printf("Hellow, World\n안녕하세요\n1234567890\nabcdefg");
    return 0;
}