mistake

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

//putchar suppose to output changed c, in case putchar(c+3) there was mistake, which was not obvious for me
//putchar put cursor at the beginning of second line, so I had to tape over it!!!
//then i got it: it's just happened that '\n'+3 equals go to the start of current line

int main()
{
    int c;

    while((c=getchar())!=EOF)
    {
       // putchar(c);
        //putchar(++c);
        putchar(c+3);//
    }

     return 0;
}