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)