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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))