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## Ref.
## https://leetcode.com/problems/first-letter-to-appear-twice/description/
## https://medium.com/@ac.shreedhar/2351-first-letter-to-appear-twice-in-java-970f99e3f625
## https://algo.monster/liteproblems/2351
def GetFirstAppearTwice (strFunc):
arrResult = [strFunc[0]]
for nIndx in range(1, len(strFunc)):
if strFunc[nIndx] in arrResult:
return strFunc[nIndx]
arrResult.append(strFunc[nIndx])
return ""
## strInput = "acbddbca" ## Example 1
## strInput = "abccd" ## Example 2
strInput = "abcdabbb" ## Example 3
print (GetFirstAppearTwice (strInput))
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