Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(10**9)

def mi(): return map(int,input().split())
def ii(): return int(input())
def isp(): return input().split()
def deb(text): print("-------\n{}\n-------".format(text))

INF=10**20
def main():
    N,K,C=mi()
    S=list(input())
    ok,ng = "o","x"

    OK = []
    for i in range(N):
        if S[i] == ok:
            OK.append(i+1) # 1-index
    
    greeds = [OK[0]]
    for i in range(1,len(OK)):
        x = OK[i]
        if x - greeds[-1] > C:
            greeds.append(x)

    inv_greeds = [OK[-1]]
    for i in range(1,len(OK)):
        x = OK[::-1][i]
        if -x + inv_greeds[-1] > C:
            inv_greeds.append(x)
    
    if len(greeds) < K or len(inv_greeds) < K:
        exit()

    greeds = greeds[:K]
    inv_greeds = inv_greeds[:K][::-1]

    # print(greeds,inv_greeds)
    for i in range(len(greeds)):
        if greeds[i] == inv_greeds[i]:
            print(greeds[i])



    
if __name__ == "__main__":
    main()

Fixed submission:
import sys
sys.setrecursionlimit(10**9)

def mi(): return map(int,input().split())
def ii(): return int(input())
def isp(): return input().split()
def deb(text): print("-------\n{}\n-------".format(text))

INF=10**20
def main():
    N,K,C=mi()
    S=list(input())
    ok,ng = "o","x"

    OK = []
    for i in range(N):
        if S[i] == ok:
            OK.append(i+1) # 1-index
    
    greeds = [OK[0]]
    for i in range(1,len(OK)):
        x = OK[i]
        if x - greeds[-1] > C:
            greeds.append(x)
            if len(greeds) > K:
                break

    inv_greeds = [OK[-1]]
    inv_OK = OK[::-1]
    for i in range(1,len(OK)):
        x = inv_OK[i]
        if -x + inv_greeds[-1] > C:
            inv_greeds.append(x)
            if len(inv_greeds) > K:
                break
    
    if len(greeds) < K or len(inv_greeds) < K:
        exit()

    greeds = greeds[:K]
    inv_greeds = inv_greeds[:K][::-1]

    # print(greeds,inv_greeds)
    for i in range(len(greeds)):
        if greeds[i] == inv_greeds[i]:
            print(greeds[i])



    
if __name__ == "__main__":
    main()

Buggy python submission (verdict: Time Limit Exceeded):
import sys
sys.setrecursionlimit(10**9)

def mi(): return map(int,input().split())
def ii(): return int(input())
def isp(): return input().split()
def deb(text): print("-------\n{}\n-------".format(text))

class SuperArray:
    def __init__(self,init_array=[]):
        self.arr = init_array
        self.se = set(init_array)
    
    def __getitem__(self, item):
        return self.arr[item]

    def append(self,x):
        self.arr.append(x)
        self.se.add(x)
    
    def remove(self,x):
        self.arr.remove(x)
        self.se.remove(x)
    
    def array(self):
        return self.arr
    
    def set(self):
        return self.se


INF=10**20
def main():
    N,K,C=mi()
    S=list(input())
    ok,ng = "o","x"

    OK = []
    for i in range(N):
        if S[i] == ok:
            OK.append(i+1) # 1-index
    
    greeds = [OK[0]]
    for i in range(1,len(OK)):
        x = OK[i]
        if x - greeds[-1] > C:
            greeds.append(x)

    inv_greeds = [OK[-1]]
    for i in range(1,len(OK)):
        x = OK[::-1][i]
        if -x + inv_greeds[-1] > C:
            inv_greeds.append(x)
    
    greeds  = greeds[:K]
    inv_greeds = inv_greeds[:K][::-1]

    # print(greeds,inv_greeds)
    for i in range(len(greeds)):
        if greeds[i] == inv_greeds[i]:
            print(greeds[i])



    




if __name__ == "__main__":
    main()

Fixed submission:
import sys
sys.setrecursionlimit(10**9)

def mi(): return map(int,input().split())
def ii(): return int(input())
def isp(): return input().split()
def deb(text): print("-------\n{}\n-------".format(text))

INF=10**20
def main():
    N,K,C=mi()
    S=list(input())
    ok,ng = "o","x"

    OK = []
    for i in range(N):
        if S[i] == ok:
            OK.append(i+1) # 1-index
    
    greeds = [OK[0]]
    for i in range(1,len(OK)):
        x = OK[i]
        if x - greeds[-1] > C:
            greeds.append(x)
            if len(greeds) > K:
                break

    inv_greeds = [OK[-1]]
    inv_OK = OK[::-1]
    for i in range(1,len(OK)):
        x = inv_OK[i]
        if -x + inv_greeds[-1] > C:
            inv_greeds.append(x)
            if len(inv_greeds) > K:
                break
    
    if len(greeds) < K or len(inv_greeds) < K:
        exit()

    greeds = greeds[:K]
    inv_greeds = inv_greeds[:K][::-1]

    # print(greeds,inv_greeds)
    for i in range(len(greeds)):
        if greeds[i] == inv_greeds[i]:
            print(greeds[i])



    
if __name__ == "__main__":
    main()

Buggy python submission (verdict: Runtime Error):
import sys
sys.setrecursionlimit(10**9)

def mi(): return map(int,input().split())
def ii(): return int(input())
def isp(): return input().split()
def deb(text): print("-------\n{}\n-------".format(text))

class SuperArray:
    def __init__(self,init_array=[]):
        self.arr = init_array
        self.se = set(init_array)
    
    def __getitem__(self, item):
        return self.arr[item]

    def append(self,x):
        self.arr.append(x)
        self.se.add(x)
    
    def remove(self,x):
        self.arr.remove(x)
        self.se.remove(x)
    
    def array(self):
        return self.arr
    
    def set(self):
        return self.se


INF=10**20
def main():
    N,K,C=mi()
    S=list(input())
    ok,ng = "o","x"

    OK = []
    for i in range(N):
        if S[i] == ok:
            OK.append(i+1) # 1-index
    
    greeds = [OK[0]]
    G = {OK[0]:1}
    for i in range(1,len(OK)):
        x = OK[i]
        if x - greeds[-1] > C:
            greeds.append(x)
            G[x] = len(greeds)
        
        if len(greeds) == K: # ? 
            break
    
    # print(greeds)
    ans = []
    for i,x in enumerate(greeds): # xなしで成り立つかどうか調べる
        available = -1
        new_list = [0]
        is_last = i == len(greeds) - 1
        for j in range(1,len(OK)):  
            _x = OK[j]
            if _x != x and (new_list[-1] == 0 or  _x - new_list[-1] > C):
                new_list.append(_x)
                if _x in G and not is_last:
                    # print("_x",_x)
                    # print("G",G[_x])
                    new_list = new_list[1:]
                    available = (K - G[_x] + 1) + len(new_list) - 1
                    assert available >= 0
                    break
        
        if available == -1:
            new_list = new_list[1:]
            available = len(new_list)
        
        # print(x,available)
        if available < K:
            ans.append(x)

    print(*ans,sep='\n')





        




if __name__ == "__main__":
    main()

Fixed submission:
import sys
sys.setrecursionlimit(10**9)

def mi(): return map(int,input().split())
def ii(): return int(input())
def isp(): return input().split()
def deb(text): print("-------\n{}\n-------".format(text))

INF=10**20
def main():
    N,K,C=mi()
    S=list(input())
    ok,ng = "o","x"

    OK = []
    for i in range(N):
        if S[i] == ok:
            OK.append(i+1) # 1-index
    
    greeds = [OK[0]]
    for i in range(1,len(OK)):
        x = OK[i]
        if x - greeds[-1] > C:
            greeds.append(x)
            if len(greeds) > K:
                break

    inv_greeds = [OK[-1]]
    inv_OK = OK[::-1]
    for i in range(1,len(OK)):
        x = inv_OK[i]
        if -x + inv_greeds[-1] > C:
            inv_greeds.append(x)
            if len(inv_greeds) > K:
                break
    
    if len(greeds) < K or len(inv_greeds) < K:
        exit()

    greeds = greeds[:K]
    inv_greeds = inv_greeds[:K][::-1]

    # print(greeds,inv_greeds)
    for i in range(len(greeds)):
        if greeds[i] == inv_greeds[i]:
            print(greeds[i])



    
if __name__ == "__main__":
    main()