Judgement: WA
Solution:
#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long
#define pb push_back
#define all(x) (x).begin(), (x).end()
const char nl = '\n';
string ans(string str) {
ll int len = str.length();
if (len < 3) return "-1";
for (ll int i = len - 3; i < len; ++i) {
for (char digit = '0'; digit <= '9'; ++digit) {
string temp = str;
temp[i] = digit;
if (stoi(temp.substr(len - 3, 3)) % 8 == 0) {
return temp;
}
}
}
return "-1";
}
inline void solve() {
ll int N;
string str;
cin >> N >> str;
if (str == "0") {
cout << 0 << nl;
return;
}
if (str.length() >= 3 && stoi(str.substr(str.length() - 3, 3)) % 8 == 0) cout << str << nl;
else {
string result = ans(str);
if (result != "-1") cout << result << nl;
else cout << 8 << nl;
}
}
int main() {
ios_base::sync_with_stdio(0); cin.tie(0);
ll int T;
cin >> T;
while (T--) {
solve();
}
return 0;
}