import sys


def f1(v1):
      print "alfa"
      a = v1+1
      f2(a)

def f2(v1):
      print "beta"
      a = v1+1
      f3(a)
def f3(v1):
      a = v1+1
      f4(a)
      print "gama"

def f4(v1):
      print "delta"
      a = v1+1
      f5(a)
def f5(v1):
      a = v1+1
      print "theta "
      print a


def main():
      f1(0)