Prata list 8.2 mistake

#include <stdio.h>

int main()
{

    char ch; //i did with char, it's working, watch for answer here
    //https://otvet.mail.ru/question/209913858

    //printf("%d\n",EOF);

    while( (ch = getchar()) !=EOF)
    {
        putchar(ch);

    }
    return 0;
}