if __name__ == '__main__':
    i=10
    s="good"
    print("{0}".format(i%2))
    print("{0}".format(i % 2))
    str = 'good luck to {0} '
    print(str.format("serer"))
    print("good luck to {0}")
    print("{1}good {0} luck to {1} ".format("good","luck"))
