from random import randint


def base62_encode(deci):
    s = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'
    hash_str = ''
    while deci > 0:
        hash_str = s[deci % 62] + hash_str
        deci /= 62
    return hash_str

if __name__ == '__main__':
    for _ in range(20):
        num = randint(10000000000000000, 90000000000000000)
        print(base62_encode(num))