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#!/usr/bin/env python3
import sys
def key_changes(s: str) -> int:
# Convert the string to lower case
s = s.lower()
# Start with the first letter
current_key = s[0]
# Count the number of times we change keys
changes = 0
for letter in s:
if letter != current_key:
# We need to change key
current_key = letter
changes += 1
return changes
def main():
# Convert input into integers
result = key_changes(sys.argv[1])
print(result)
if __name__ == '__main__':
main()
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