Key Switches While Typing

Easy

The string text is what someone typed on a keyboard, one letter at a time. A key switch happens when a letter is typed with a different key than the letter before it. Shift and Caps Lock do not matter: a and A come from the same key. Return how many times the typist switched keys.

Example 1

text="HelLo" → 3

H→e is a new key, e→l is a new key, l→L is the same key with Shift, L→o is a new key. That makes 3.

Example 2

text="mMmM" → 0

The same m key is pressed every time; case does not count.

Example 3

text="Q" → 0

Constraints

1 ≤ len(text) ≤ 100
text consists only of lowercase and uppercase English letters

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String

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Input

text="HelLo"

Expected

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