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#!/usr/bin/env python3
def ops(number, length):
b = bin(number)[2:]
return '+' * (length - len(b)) + b.replace('0', '+').replace('1', '-')
def libai4(n):
seq, l = list(range(1, n + 1)), []
for i in range(2 ** (n - 1)):
s = ''.join(["{}{}".format(*j) for j in zip(ops(i, n), seq)])[1:]
if eval(s) == 0:
l.append(s + '=0\n')
return l
if __name__ == '__main__':
with open('BAI4.INP') as f:
n = int(f.read())
with open('BAI4.OUT', 'w') as f:
l = libai4(n)
f.write('{}\n'.format(len(l)))
for s in l:
f.write(s)
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