#include <stdio.h>
int main() 
{
    //실습1//
   /* printf("hello world");*/
   //실습2//
   /* printf("hello world");
   printf ("안녕하세요");
   printf ("1234567890");
   printf ("abcdefg");*/
    //실습3//
/*printf ("hello world안녕하세요1234567890abcdef\n");*/
    //실습4//
    /* printf("hello world\n");
   printf ("안녕하세요\n");
   printf ("1234567890\n");
   printf ("abcdefg\n");*/
    //실습5//
    printf ("hello world\n안녕하세요\n1234567890\nabcdef\n");
    return 0;
}