import sys
import random
 
users = sys.stdin.readline().split(', ')
print random.choice(users)

aW1wb3J0IHN5cwppbXBvcnQgcmFuZG9tCgp1c2VycyA9IHN5cy5zdGRpbi5yZWFkbGluZSgpLnNwbGl0KCcsICcpCnByaW50IHJhbmRvbS5jaG9pY2UodXNlcnMp

d3N6eXN0a2llZmFqbmVuaWNraXNhemFqZXRlLCBrdWhhciwgd29qamFza3VsYSwgc2lsZW50X2RpZ2czciwgeENpbmVrLCBTaXhzaG9lcyAsZ3dpemRpMjkwNywgc3VwZXJuaWNrYnVsd28sIFNlYmVrMTIzMiwgUHJpbW96YSwga295b3QxNyAsZHppa2kxNyAsU2llbml1ICxsb21pciwgcnViZXNvbSAsd2FqZHppayAsdHVyYm9zb3dhICxjeml0ZXJ1cyAsYnNjaDkzICxheGVsZWsxNCAsbXVza3UsIFRvcmNobGlnaHQsIFZlbmNpdGUgLHF1emlwbCwgVG9wZXYsIFRoZWJyZSwga3JlaXdzLCBWdXJ1eCwgSGFydE9yZSwgWmlvbWJlbGxvLCBCbGFja0V5ZWREb2csIGZyZWVnYW1tZXIsIER5ZGVxLCBsZW50LCBldGVybmFsX3NsYXZvLCB1bmdhZ2VkLCBLdXJ6ZWdvU3RhcmEsIFRldHVyLCBrb2xjemFuX3ByYXdpbG5vc2NpLCBXc3Rhd1ppZW1uaWFraSwgc2Vuc3UsIE5pa28yMywgUGFsZXRrYSwgTmllemFsZXpueV9aYXdhbG93aWVjLCBFbmVlTSwgS3J6eXN6dG9mSmVyenluYSwgTXlyenluLCBLbGVqcm9sLCBxcHM2NjYsIENpZXJwc2FuaXR5LCBLcndpb3plcmN6eVdvbWJhdCwgRmV1Zm9yY2UsIERyYWdvbk1hdGksIG5vY255X3ByemVncnl3LCBudXV1bmUsIGt1ZGxhdHlnb3NjLCBkMWNrLCBlYXN5X3RvX2dvLCBUdXJrbGVzcywgQ2hpYmlQYW5kYSwgVG9tZWs3MjIyMiwgS3RvVG9UYWtpLCBKb2hueV9HaXRhcnp5c3RhNjksIFJvenRyb3BueSwgZHltc29uLCBkYXdpZDExMGQsIERhd2lkaW5obzgsIFVrdWt1a2ksIGp1bm9taXBsLCBERkVOUywgV29qdGFzMDg3LCBob3VzZXdpaSwgY3Jhc3RlcjkyLCBuZHIzdiwgYmFiZWMsIGJ1bW5pLCBkX19fX19iLCBudXdhbmRhLCBNaXJvcmltLCBraXRjcmUsIGh4cnBsLCBjaW5lbWF0aWNzLCBOb2tqYSwgc3V0ZXIsIEdvdHRlaywgQmltYmVybWFlaXN0ZXIsIG9ub21hdG9iZWthLCBFa3NwbG9yYXRvclByemVncnl3LCBNaXRoT25GcmVuenksIEFwbGFzaWRvbiwgRWt3aWxpYnJ5c3R5Y3pueSwgUW5pb28sIGxld29yd2VsLCByYWJiaXRhdCwgS2FsYWZpb3JlcywgcGllc3ByemV3b2RuaWssIHN1bnksIEthbG9yLCBlcnJvcmVrOTUsbWNfYW1iYXNhZG9yLCBqYWt1Ym5uLCBEb2trYmxhciwga2FkaWxha3lvLCBKZXp1c0Fkb2xmSGl0bGVySnVzdGluQmllYmVyMSwgTWF0ZXVzenVzeiwgRHJlamssIFBvbDc1MywgQmVybmFuLCBkb25PR1IsIEhhbG9HYW5kYWxmLCBBcmNoYUFuaW9sLCBMeXNhY3oxLCBCbGFja1dpZG93ZXIsIG11c2xpXywgTG9kb3d5S3JvbCwgamFjb196ZXdhLCBQYW5jaGl0YSwgcGxhc3RpYzExLCBQYW5jaG8sIEtvY2hhbmVrLCB6Z29uNDA5LCBhbmV0YXoyOSwgTmF6aW4sIE1hcmVsZG8sIEJuYWtlLCBtaXh5eXIsIEZpYmkwNywgQnVsem9yLCBNeXJvTjk1LCBBbWEtZ2ksIHByemVwaXNhaywgZm9yaXN0YWluLCBvaG55MTFmaW5nZXJzLCBjbGlja1BMVVMsIFdBTEVSWEQsIGppZ2x5LCBDTERSLCBNb21iaWssIFNwZWN0ZXIwMCwgd2llbGtpX2R6aWt1LCB3b256a2ksIHNsYXdlazg5LCBwZWVyZXMsIG1pY2hhbGluZCwgcmVrYXJpMSwgamtiY2ssIFN1bnN0b3JtLCBCbGF6a29ELCBtYXR1czExMiwgc2FkYW16LCBNaXJpbiwgbWFkeml1bGVrODUsIEphbmtpbm8sIEJyZW5pYWN6LCBpbmRpYW5pbmthLCBuaWtvMTQsY2h5dHJ5bWFseWdsb24sIHRvbWltYXIsIHNwb2tvaiwgVW5LYXRzdSwgRWxDaWRYLCByZW1pbmRyLCBLWVEsIFN6bGlmLCB6YXdvcGwsIGJ1amEsIGltcGFjdDE4LCBMaWxhYywgR3Jvem55X1dvem55LCBMeXN5X2lfc2xlcHksIEF3ZXNvbWVfbWVuLCBGYXN0TWFuUEwsIGdyaW0sIGthcm9sYWpqbm4sIG1hY2lla21tLCBoZXNhciwgbGFnYW5lazI4LCByZXB0YWxpYW4sIGRmbHQsIHBhbmtyb2tvd2llYywgUnVmdXNzLCBsdWNreTcsIEJpZWRyb25rYTA3LCBkaXZpbnVzcywgemVyb3dpZWMsIEthcjE5NDU=

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