def perform_cnt(word):
res = ''
uniq_let = word[0]
cnt = 0
for let in word:
if uniq_let == let:
cnt += 1
else:
res += uniq_let + str(cnt)
uniq_let = let
cnt = 1
res += uniq_let + str(cnt)
return res
if __name__ == '__main__':
print(perform_cnt("coooccck"))
assert perform_cnt("coooccck") == 'c1o3c3k1'# your code goes here
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