Swapping letters

# -*- coding: utf-8 -*-
"""
Created on Sat Sep 15 14:39:21 2018

@author: kiyakf1
"""
import itertools

n = int(raw_input())
pairs = []

for i in range(n):
    pairs.append(raw_input().split(" "))

x = list(raw_input())
y = list(raw_input())


def code(string,pair1,pair2):
    
    for ch in string:
        if ch == pair1 or ch == pair2:
            yield ch

for p1,p2 in pairs:
    
    for o1,o2 in itertools.izip_longest(code(x,p1,p2),code(y,p1,p2)):
        if(o1!=o2):
            print("NO")
            exit()
    

print("YES")

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: TIME LIMIT EXCEEDED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: TIME LIMIT EXCEEDED

Test 7

Verdict: TIME LIMIT EXCEEDED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: WRONG ANSWER

Test 10

Verdict: WRONG ANSWER