_/\_

import random

opt = input()

opt = opt.split(" ")

def st(n):
    i = 0
    s = "AaB1C{DbE2FcG3HdI4JeK5LfM6NgO7PhQ8RiS9TjU0VkW-XlY[Zma]bnn\dor'yp7;6q4,srl.p<0s-/+t>!)?u@:v#w$x(%}y^|z&"

    while len(s) != n:
        s += r(i)
        i +=1
    return s

def r(i):
    s = "AaB1C{DbE2FcG3HdI4JeK5LfM6NgO7PhQ8RiS9TjU0VkW-XlY[Zma]bnn\dor'yp7;6q4,srl.p<0s-/+t>!)?u@:v#w$x(%}y^|z&"
    random.seed(i)
    t = random.randint(1,101)
    return s[t]

def enter_substring(st,original):
    l = len(st)
    f = 0
    for i in range(len(original)):
        l_count = 0
        if st[0] == original[i]:
            for j in range(len(st)):
                if st[j] == original[i+j]:
                    l_count += 1

            if l_count == l:
                print("offset = ",i+1)
                f = 1

    if f == 0:
        print("wrong substring entered!")

if int(opt[0]) == 1 and int(opt[1])<102:
    s = "AaB1C{DbE2FcG3HdI4JeK5LfM6NgO7PhQ8RiS9TjU0VkW-XlY[Zma]bnn\dor'yp7;6q4,srl.p<0s-/+t>!)?u@:v#w$x(%}y^|z&"
    print(s[:int(opt[1])])

if int(opt[0]) == 1 and int(opt[1])>=102:
    print(st(int(opt[1])))

if int(opt[0]) == 2:
    original = st(20280)

    enter_substring(str(opt[1]),original)