add ARC003A

Author: IsHYuhi

ARC/ARC003/A.py

@@ -0,0 +1,7 @@
+n = int(input())
+total = 0
+dic = {'A': 4, 'B': 3, 'C': 2, 'D': 1, 'F':0}
+gp = list(input())
+for e in gp:
+    total += dic[e]
+print(total/n)