PHP Compiler Testing
Upper or Lower Case

Return the smallest number of steps it takes to convert a string entirely into uppercase or entirely into lower case, whichever takes the fewest number of steps. A step consists of changing one character from lower to upper case, or vice versa.

Examples

steps_to_convert("abC") ➞ 1

# "abC" converted to "abc" in 1 step

 

steps_to_convert("abCBA") ➞ 2

# "abCBA" converted to "ABCBA" in 2 steps

 

steps_to_convert("aba") ➞ 0

 

steps_to_convert("abaCCC") ➞ 3