I have WA1 too, i cant understand why, because example from briefing was ok.

Python code:

from sys import stdin, stdout

N = int(stdin.readline())

D = {}

for i in range(N):
    inp = stdin.readline().split(' ')
    D[inp[0]]=int(inp[1])

for tup in sorted(D.items(), key=lambda x: x[1], reverse=True):
    print(tup[0], tup[1])