def check_column(field, index):
    used = set(field[index])
    return used == {1, 2, 3, 4, 5, 6, 7, 8, 9}


def check_row(field, index):
    used = set()
    for column in field:
        used.add(column[index])
    for num in [1, 2, 3, 4, 5, 6, 7, 8, 9]:
        if num not in used:
            return False
    return len(used) == 9


def check_square(field, row, column):
    used = set()
    for add_x in range(3):
        for add_y in range(3):
            used.add(field[row + add_x][column + add_y])
    for num in [1, 2, 3, 4, 5, 6, 7, 8, 9]:
        if num not in used:
            return False
    return len(used) == 9


def check(field):
    """Checks that given field if correct field of game Sudoku"""
    for index in range(9):
        if not check_row(field, index) or not check_column(field, index):
            return "НЕТ"
    for row in range(0, 7, 3):
        for column in range(0, 7, 3):
            if not check_square(field, row, column):
                return "НЕТ"
    return "ДА"