users = [
            ['kek', '123'],
            ['Chumok', '456'],
            ['Killer', '789'],
            ['Omws', '321'],
            ['Oops', '654'],
            ['Booby', '987']
        ]

def check(login, password) :
    for i in range(len(users)):
        if users[i][0] == login and users[i][1] == password :
            return True

    return False

def auth() :
    login = input('Send you login: ')
    password = input('Send you password: ')

    if check(login, password) :
        print("Welcome")
    else :
        print("Wrong login or password. Try again")
        auth()

auth()