import sys

#inFile = sys.stdin

beginSig = "-----BEGIN PGP"
endSig = "-----END PGP"
output = ""
keyBegun = False

for line in sys.stdin:
	sigIndex = 0
	if beginSig in line:
		if keyBegun:
			exit(1)
		keyBegun = True
		sigIndex = line.find(beginSig)
	if keyBegun:
		output += line[sigIndex:]
	if endSig in line:
		break

print(output)