Merge pull request ZoranPandovski#1 from SaiSudhaV/SaiSudhaV-patch-1

Group the similar characters in combinations and concatenate first and last elements alternatively

LexicographicalGrouping.py

@@ -0,0 +1,19 @@
+def GroupRotation(s, n):
+    tem, res = [], ""
+    for i in sorted(set(s.lower())):
+        comb = [i for i in range(n) if s[i].lower() == s]
+        print(comb)
+        p = ""
+        for i in comb:
+            p += s[i]
+        tem.append(p)
+    m = len(tem)
+    for i in range(m // 2):
+        res += tem[i] + tem[-(i + 1)]
+        if m % 2:
+            res += tem[m // 2]
+    return res
+
+if __name__ == "__main__":
+    s = input()
+    print(GroupRotation(s, len(s)))