#include <bits/stdc++.h>
using namespace std;
int main() {
// your code goes here
string s;
cin >> s;
int n = s.length();
int l = 0, lc = 0;
for (int i = 0; i < n; i++){
if(s[i] == 'L') l++;
if(s[i] == 'C') lc += l;
}
cout << lc;
return 0;
}
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