为啥无输出？

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cmath>
#include<iomanip>
#include<cstring>
#include<bits/stdc++.h>
using namespace std;

int main(){
    freopen("count.in","r",stdin);
    freopen("count.out","w",stdout);
    string str;
    cin>>str;
    str.erase(10,4);
    cout<<str<<endl;


    return 0;
}