cứu em ạ. lát em phải nộp rồi huhu

#include <bits/stdc++.h>
using namespace std;

int main(){
    string s;
    cin >> s;
    if (s . size() != 4) cout << "0";
    else 
    {
        int cnt = 0, cnt1 = 0;
        for (int i = 0; i < s . size() / 2; ++i)
        {
            cnt += s[i] - '0';
        }
        for (int i = s . size() / 2; i < s . size(); ++i)
        {
            cnt1 += s[i] - '0';
        }
        if (cnt >= cnt1) cout << cnt << cnt1;
        else cout << cnt1 << cnt;
    }
}

#include <iostream>
using namespace std;
int main() {
string st;
cin>>st;
if (st.size()==4) {
int c=st[0]+st[1]-st[2]-st[3];
cout<<abs(c)<<st[0]+st[1]-'0'*2+st[2]+st[3]-'0'*2-abs(c);
} else {
cout<<"0";
}
return 0;
}