PY
py
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def enc(s):
r = b = ''
for c in s:
if b is c:
n += 1
continue
if b:
r += str(n) + b
b, n = c, 1
return r + str(n) + b
def dec(s):
return ''.join([int(s[2*i]) * s[2*i+1] for i in range(len(s)//2)])
def main(s):
from re import match
return dec(s) if match('(\d\w)+',s) else enc(s)
print(main(input()))
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OUTPUT
Run