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OI-codes/S2OJ/130/130.cpp

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#include <bits/stdc++.h>
using namespace std;
long long l[150005], lw[150005], lws[150005];
string s;
int main() {
cin >> s;
s = ' ' + s;
for (int i = 1; i < s.size(); i++) {
l[i] = l[i - 1] + (s[i] == 'L');
lw[i] = lw[i - 1] + (s[i] == 'W') * l[i];
lws[i] = lws[i - 1] + (s[i] == 'S') * lw[i];
}
cout << lws[s.size() - 1] << endl;
return 0;
}