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class Solution:
"""
@param S: a string
@param K: a integer
@return: return a string
"""
def licenseKeyFormatting(self, S, K):
# write your code here
ret = []
count = 0
for i in range(len(S) - 1, -1, -1):
if S[i] != '-':
count += 1
ret.append(S[i].upper())
if (count % K) == 0:
ret.append('-')
if ret[-1] == '-':
ret.pop()
ret.reverse()
return ''.join(ret)
# easy: https://www.lintcode.com/problem/license-key-formatting/
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