同样给出两种语言解法(～￣▽￣)～

C++：

#include <bits/stdc++.h>
using namespace std;
int main()
{
    string a;
    int b;
    getline(cin,a);
    cin >> b;
    for (int i = 0; i < a.size(); i++)
    {
        if (i == b) cout << endl;
        cout << a[i];
    }
    return 0;
}

python:

a = input()
b = int(input())
for i in range(len(a)):
    if i == b - 1:
        print(a[i])
        continue
    print(a[i],end = '')

AC!

#include <bits/stdc++.h>
using namespace std;
int main()
{
    string s;
    int n;
    getline(cin,s);
    cin >> n;
    for (int i = 0;i < s.size();i++)
    {
        cout << s[i];
        if (i == n - 1) cout << endl;
    }
}