Family reunion

#include <iostream>

using namespace std;

int main () {
  int peoplec, tablec, seenc;
  cin >> peoplec >> tablec >> seenc;

  int opos = 15;
  for (int i = 0; i < 2 * seenc + 1; i++) {
    int person;
    cin >> person;

    if (person == 1) {
      opos = i;
    }
  }

  cout << (opos % 2 ? 'A' : 'B') << endl;
}

Test 1

Group: 1

Verdict: UNKNOWN

Test 2

Group: 2

Verdict: UNKNOWN

Test 3

Group: 3

Verdict: UNKNOWN