diff --git a/S2OJ/130/130.cpp b/S2OJ/130/130.cpp
new file mode 100644
index 00000000..5a84b4b1
--- /dev/null
+++ b/S2OJ/130/130.cpp
@@ -0,0 +1,18 @@
+#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;
+}