Buggy python submission (verdict: Time Limit Exceeded):

# -*- coding: utf-8 -*-

import copy 
N, K, C=map(int, input().split())
s=list(input())


for i in range(N):
    if s[i]=='o':
        si=copy.copy(s)
        si[i]='x'
        day=N
        count=0
        flag=False
        while day>0 and day>=K-count and count<K:
            if si[day-1]=='x':
                day-=1
            else:
                count+=1
                day-=C+1
                if count==K:
                    flag=True
        if flag==False:
            print(i+1)
            



Fixed submission:

# -*- coding: utf-8 -*-

import numpy as np
N, K, C=map(int, input().split())
s=list(input())

forward=np.zeros(K)
back=np.zeros(K)

day=0
count=0
while day <N and count<K:
    if s[day]=='o':
        forward[count]=day
        count+=1
        day+=C+1
    else:
        day+=1

day=N-1
count=0
while day<N and count<K:
    if s[day]=='o':
        back[count]=day
        count+=1
        day-=C+1
    else:
        day-=1

#print(forward)
#print(back[::-1])

for i in range(K):
    if forward[i]==back[K-1-i]:
        print(int(forward[i])+1)

Buggy python submission (verdict: Runtime Error):
for i in range(N):
    if s[i]=='o':
        si=copy.copy(s)
        si[i]='x'
        day=N
        count=0
        flag=False
        while day>K-1 and count<K:
            if si[day-1]=='x':
                day-=1
            else:
                count+=1
                day-=C+1
                if count==K:
                    flag=True
        if flag==False:
            print(i+1)

Fixed submission:

# -*- coding: utf-8 -*-

import numpy as np
N, K, C=map(int, input().split())
s=list(input())

forward=np.zeros(K)
back=np.zeros(K)

day=0
count=0
while day <N and count<K:
    if s[day]=='o':
        forward[count]=day
        count+=1
        day+=C+1
    else:
        day+=1

day=N-1
count=0
while day<N and count<K:
    if s[day]=='o':
        back[count]=day
        count+=1
        day-=C+1
    else:
        day-=1

#print(forward)
#print(back[::-1])

for i in range(K):
    if forward[i]==back[K-1-i]:
        print(int(forward[i])+1)

Buggy python submission (verdict: Time Limit Exceeded):

# -*- coding: utf-8 -*-

import copy 
N, K, C=map(int, input().split())
s=list(input())


for i in range(N):
    if s[i]=='o':
        si=copy.copy(s)
        si[i]='x'
        day=N
        count=0
        flag=False
        while day>0 and count<K:
            if si[day-1]=='x':
                day-=1
            else:
                count+=1
                day-=C+1
                if count==K:
                    flag=True
        if flag==False:
            print(i+1)
            



Fixed submission:

# -*- coding: utf-8 -*-

import numpy as np
N, K, C=map(int, input().split())
s=list(input())

forward=np.zeros(K)
back=np.zeros(K)

day=0
count=0
while day <N and count<K:
    if s[day]=='o':
        forward[count]=day
        count+=1
        day+=C+1
    else:
        day+=1

day=N-1
count=0
while day<N and count<K:
    if s[day]=='o':
        back[count]=day
        count+=1
        day-=C+1
    else:
        day-=1

#print(forward)
#print(back[::-1])

for i in range(K):
    if forward[i]==back[K-1-i]:
        print(int(forward[i])+1)