参考答案：

#include<iostream>
#include<string>
using namespace std;
int main()
{
    int n;
    while (cin >> n)
    {
        char a[1000][5];
        int i, j;
        for (i = 1; i < n + 1; ++i) scanf("%s", a[i]);
        for (i = 1; i < n + 1; ++i)
        {
            if (a[i][0] == 'O' && a[i][1] == 'O')
            {
                a[i][0] = '+', a[i][1] = '+';
                cout << "YES" << endl;
                break;
            }
            if (a[i][3] == 'O' && a[i][4] == 'O')
            {
                a[i][3] = '+', a[i][4] = '+';
                cout << "YES" << endl;
                break;
            }
        }
        if (i == n + 1) cout << "NO" << endl;
        else
        {
            for (i = 1; i < n + 1; ++i)
            {
                for (j = 0; j < 5; ++j)
                {
                    cout << a[i][j];
                }
                cout << endl;
            }
        }
    }
    return 0;
}