#include <iostream>
#include <string>

using namespace std;
int main()
{
    string sentence;
    getline( cin, sentence);
    int circle = 0, square = 0, figure = 0;
    for (int i = 0; i < sentence.size(); i++)
    {
        if ( circle >= 0 && square >= 0 && figure >= 0) {


            switch (sentence[i]) {
                case '(':
                    circle++;
                    break;

                case '[':
                    square++;
                    break;

                case '{':
                    figure++;
                    break;

                case ')':
                    circle--;
                    break;

                case ']':
                    square--;
                    break;

                case '}':
                    figure--;
                    break;

                default:
                    break;
            }
        }
        else
        {
            break;
        }
    }

    if ((circle == 0) && (square == 0) && (figure == 0))
    {
        cout << " All right!\n";
    }
    else
    {
        cout << " Mistake!\n";
    }

}