AC代码：

#include <iostream>
#include <cstdio>
using namespace std;
int main(void)
{
    freopen("in.txt","r",stdin);
    char a;
    while(scanf("%d",&a)!=EOF)
    {
        printf("%c",a);
    }
    printf("\n");
    
    fclose(stdin);
    return 0;    
}