class neat(object):
def __init__(self):
self.print_string()
def print_string(self):
s = ''
while raw_input() != '0':
s+=chr(self.get_char()+(1<<6)+(1<<5))
print(s)
def get_char(self):
char = 0
while raw_input() != '0':
char+=1
return char
if __name__ == '__main__':
neater = neat()
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