Letters in Both Cases

Easy

You get a string text made of English letters. Call a letter two-faced if it appears in text both in lowercase and in uppercase (for example, both q and Q). Return the number of distinct two-faced letters.

Example 1

text="BoatbOAt" → 3

b, o and a appear both in lowercase and in uppercase, while t is only lowercase. The answer is 3.

Example 2

text="HELLO" → 0

There are no lowercase letters at all, so the answer is 0.

Example 3

text="xYyX" → 2

Constraints

1 ≤ len(text) ≤ 50
text consists only of lowercase and uppercase English letters

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Topics

Hash Table String

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Input

text="BoatbOAt"

Expected

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