#!/usr/bin/python3


def palindroma(d):
	keys=[]
	for key,value in d.items():
		if value==value[::-1]:
			keys.append(key)
	return keys

def main():
	d={
		"1":"hello",
		"2":"anna",
		"3":"gog",
		"4":"pen",
		"5":"five"

	}

	print(palindroma(d))

if __name__=="__main__":
	main()