GRAND ASSIGNMENT - 2 One Color

 One Color

Given a string of length N, made up of only uppercase characters 'R' and 'G', where 'R' stands for Red and 'G' stands for Green. Find out the minimum number of characters you need to change to make the whole string of the same colour.

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Input

The input will be a single line containing a string.

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Output

The output should be single line containing the integer representing the minimum number of characters you need to change to make the whole string of the same colour.

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Explanation

For example, if string is "GGGGGGR" . We need to change only the last character to 'G' to make the string same-coloured.then output is 1.

Sample Input 1

GGGGGGR

Sample Output 1

1

Sample Input 2

RGG

Sample Output 2

1

str=input()
r,g=0,0
for char in str:
    if char =="R":
        r+=1 
    else:
        g+=1 
print(min(r,g))