#include <iostream>
#include <cstring>
#include <cstdlib>

using namespace std;

enum { jan=1, feb, mar, apr, may, jun, jul, aug, sep, octb, nov, decm };

int main() {
    char date[8];
    int month, day, max;

    cout<<"Enter date:"<<endl;
    cin>>date;

    month = atoi(strtok(date, "."));
    day = atoi(strtok(NULL, "."));

    switch(month) {
    case feb:
        max = 29;
        break;
    case apr: case jun: case sep: case nov:
        max = 30;
        break;
    case jan: case mar: case may: case jul: case aug: case octb: case decm:
        max = 31;
        break;
    default:
        cout<<"Wrong date\n";
        exit(0);
    }

    if(day < 1 || max < day)
        cout<<"Wrong date\n";
    else
        cout<<"OK\n";

    return 0;
}