# from dust i have come, dust i will be

import urllib.request
import json

 you = input("what is your cf handle?\n")
 other = input("what is the handle of the user you want to follow?\n")


# from the first submission to 5k th submission
# number of total submission is unknown, therefore we take 5k

# =============================================================================
url = "https://codeforces.com/api/user.status?handle=" + you + "&from=1&count=5000"
res = urllib.request.urlopen(url)
res_body = res.read()
j = json.loads(res_body.decode("utf-8"))

X = set()
m1 = 0
for subs in j["result"]:
    if subs["verdict"] == "OK":
        temp = subs["problem"]
        try:
            s = str(temp["contestId"]) + temp["index"] + ". " + temp["name"]
            X.add(s)
        except:
            m1 += 1

# =============================================================================


# =============================================================================
url = "https://codeforces.com/api/user.status?handle=" + other + "&from=1&count=5000"
res = urllib.request.urlopen(url)
res_body = res.read()
j = json.loads(res_body.decode("utf-8"))

Y = set()
m2 = 0
for subs in j["result"]:
    if subs["verdict"] == "OK":
        temp = subs["problem"]
        try:
            s = str(temp["contestId"]) + temp["index"] + ". " + temp["name"]
            Y.add(s)
        except:
            m2 += 1

cnt = 0
f = open("output.txt", "w")
for key in Y:
    if key not in X:
        f.write(key + "\n")
        cnt += 1

# =============================================================================

'''
you may want to solve those problems that an user have solved but
you haven't. just enter your handle, handle of that user, and this code will generate
a txt file with the list of the problems
'''