Add python solution

string/python-correct/SOLUTION

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+# -*- coding: utf-8; mode: python -*-
+
+## Solution
+#c_solution(src='main.c') # -lm -O2 as default
+#cxx_solution(src='main.cc', flags=[]) # -std=c++11 -O2 as default
+#java_solution(src='Main.java', encoding='UTF-8', mainclass='Main')
+#java_solution(src='Main.java', encoding='UTF-8', mainclass='Main', challenge_cases=[])
+#java_solution(src='Main.java', encoding='UTF-8', mainclass='Main', challenge_cases=['10_corner*.in'])
+#script_solution(src='main.sh') # shebang line is required
+#script_solution(src='main.pl') # shebang line is required 
+script_solution(src='main.py') # shebang line is required
+#script_solution(src='main.rb') # shebang line is required
+#js_solution(src='main.js') # javascript (nodejs) 
+#hs_solution(src='main.hs') # haskell (stack + ghc)
+#cs_solution(src='main.cs') # C# (mono)
+
+## Score
+#expected_score(100)

string/python-correct/main.py

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+#!/usr/local/bin/python3
+# -*- coding: utf-8 -*-
+
+def solve():
+    s,k = input().split()
+    k = int(k)
+
+    if k > len(s):
+        return '*'
+    else:
+        return s[k-1]
+
+def main():
+    cases = int(input())
+    for _ in range(cases):
+        print(solve())
+
+if __name__ == '__main__':
+    main()