Buggy python submission (verdict: Runtime Error):
import pandas
import math
import numpy
import collections

x = input()
TF =  x.isupper() and x.isalpha()
flg  = 0
if(TF):
    li = [i for i in x]
    count_dict = collections.Counter(li)
    list = [v for k, v in count_dict.items()]
    
    if(list == [2,2]):
        print("Yes")
        flg = 1

if(flg == 0):
    print("No")

Fixed submission:
import collections

x = input()
TF =  x.isupper() and x.isalpha()
flg  = 0
if(TF):
    li = [i for i in x]
    count_dict = collections.Counter(li)
    list = [v for k, v in count_dict.items()]
    if(list == [2,2]):
        print("Yes")
        flg = 1
if(flg == 0):
    print("No")

Buggy python submission (verdict: Runtime Error):
import pandas
import math
import numpy
import collections

x = input()
TF =  x.isupper() and x.isalpha()
if(TF):
    li = [i for i in x]
    count_dict = collections.Counter(li)
    list = [v for k, v in count_dict.items()]
    
    if(list == [2,2]):
        print("Yes")

elif(TF==False):
    print("No")
        

Fixed submission:
import collections

x = input()
TF =  x.isupper() and x.isalpha()
flg  = 0
if(TF):
    li = [i for i in x]
    count_dict = collections.Counter(li)
    list = [v for k, v in count_dict.items()]
    if(list == [2,2]):
        print("Yes")
        flg = 1
if(flg == 0):
    print("No")

Buggy python submission (verdict: Runtime Error):
import pandas
import math
import numpy
import collections

x = input()
TF =  x.isupper() and x.isalpha()
if(TF):
    li = [i for i in x]
    count_dict = collections.Counter(li)
    list = [v for k, v in count_dict.items()]
    
    if(list == [2,2]):
        print("Yes")
        
print("No")

Fixed submission:
import collections

x = input()
TF =  x.isupper() and x.isalpha()
flg  = 0
if(TF):
    li = [i for i in x]
    count_dict = collections.Counter(li)
    list = [v for k, v in count_dict.items()]
    if(list == [2,2]):
        print("Yes")
        flg = 1
if(flg == 0):
    print("No")

Buggy python submission (verdict: Runtime Error):
import pandas
import math
import numpy
import collections

x = input()
TF =  x.isupper() and x.isalpha()
if(TF):
    li = [i for i in x]
    count_dict = collections.Counter(li)
    list = [v for k, v in count_dict.items()]
    
    if(list == [2,2]):
        print("Yes")
    else:
        print("No")
print("No")
        

Fixed submission:
import collections

x = input()
TF =  x.isupper() and x.isalpha()
flg  = 0
if(TF):
    li = [i for i in x]
    count_dict = collections.Counter(li)
    list = [v for k, v in count_dict.items()]
    if(list == [2,2]):
        print("Yes")
        flg = 1
if(flg == 0):
    print("No")

Buggy python submission (verdict: Runtime Error):
import pandas
import math
import numpy
import collections

x = input()
TF =  x.isupper() and x.isalpha()
if(TF):
    li = [i for i in x]
    count_dict = collections.Counter(li)
    list = [v for k, v in count_dict.items()]
    
    if(list == [2,2]):
        print(True)
    else:
        print(False)
print(False)
        

Fixed submission:
import collections

x = input()
TF =  x.isupper() and x.isalpha()
flg  = 0
if(TF):
    li = [i for i in x]
    count_dict = collections.Counter(li)
    list = [v for k, v in count_dict.items()]
    if(list == [2,2]):
        print("Yes")
        flg = 1
if(flg == 0):
    print("No")