Buggy python submission (verdict: Runtime Error):
import re
from sys import stdin
N=(stdin.readline().rstrip())
for i in range(7):
    mae="keyence"[0:i+1]
    ato="keyence"[i+1:8]
    if (re.sub('.*keyence', '', N)=="")==True:
        print("YES")
        break
    if (re.sub('keyence.*', '', N)=="")==True:
        print("YES")
        break
    if re.match("%s.*%s"%(mae, ato),N):
        print("YES")
        cnt+=1
        break
if i==6:
    print("NO")

Fixed submission:
import re
from sys import stdin
N=(stdin.readline().rstrip())
for i in range(7):
    mae="keyence"[0:i+1]
    ato="keyence"[i+1:8]
    if re.search(".*keyencekeyence",N):
        if (re.sub('.*keyencekeyence', '', N)=="")==True:
            print("YES")
            break
    if re.search("keyencekeyence.*",N):
        if (re.sub('keyencekeyence.*', '', N)=="")==True:
            print("YES")
            break
    if (re.sub('.*keyence', '', N)=="")==True:
        print("YES")
        break
    if (re.sub('keyence.*', '', N)=="")==True:
        print("YES")
        break
    if re.match("%s.*%s"%(mae, ato),N):
        if (re.sub('%s.*%s'%(mae,ato) ,"", N)=="")==True:
            print("YES")
            break
if i==6:
    print("NO")

Buggy python submission (verdict: Runtime Error):
import re
from sys import stdin
N=(stdin.readline().rstrip())

for i in range(7):
    mae="keyence"[0:i+1]
    ato="keyence"[i+1:8]
    if re.match(".*keyence.*",N):
        print("YES")
        break
    if re.match("%s.*%s"%(mae, ato),N):
        print("YES")
        cnt+=1
        break
if i==6:
    print("NO")

Fixed submission:
import re
from sys import stdin
N=(stdin.readline().rstrip())
for i in range(7):
    mae="keyence"[0:i+1]
    ato="keyence"[i+1:8]
    if re.search(".*keyencekeyence",N):
        if (re.sub('.*keyencekeyence', '', N)=="")==True:
            print("YES")
            break
    if re.search("keyencekeyence.*",N):
        if (re.sub('keyencekeyence.*', '', N)=="")==True:
            print("YES")
            break
    if (re.sub('.*keyence', '', N)=="")==True:
        print("YES")
        break
    if (re.sub('keyence.*', '', N)=="")==True:
        print("YES")
        break
    if re.match("%s.*%s"%(mae, ato),N):
        if (re.sub('%s.*%s'%(mae,ato) ,"", N)=="")==True:
            print("YES")
            break
if i==6:
    print("NO")

Buggy python submission (verdict: Runtime Error):
from sys import stdin
N=(stdin.readline().rstrip())
for i in range(7):
    mae="keyence"[0:i+1]
    if re.match("%s.*%s"%(mae, ato),N):
        print("YES")
        break
if i==6:
    print("NO")

Fixed submission:
import re
from sys import stdin
N=(stdin.readline().rstrip())
for i in range(7):
    mae="keyence"[0:i+1]
    ato="keyence"[i+1:8]
    if re.search(".*keyencekeyence",N):
        if (re.sub('.*keyencekeyence', '', N)=="")==True:
            print("YES")
            break
    if re.search("keyencekeyence.*",N):
        if (re.sub('keyencekeyence.*', '', N)=="")==True:
            print("YES")
            break
    if (re.sub('.*keyence', '', N)=="")==True:
        print("YES")
        break
    if (re.sub('keyence.*', '', N)=="")==True:
        print("YES")
        break
    if re.match("%s.*%s"%(mae, ato),N):
        if (re.sub('%s.*%s'%(mae,ato) ,"", N)=="")==True:
            print("YES")
            break
if i==6:
    print("NO")