diff --git a/S2OJ/1556/1556.cpp b/S2OJ/1556/1556.cpp
new file mode 100644
index 00000000..b9606630
--- /dev/null
+++ b/S2OJ/1556/1556.cpp
@@ -0,0 +1,57 @@
+#include <iostream>
+#include <algorithm>
+#include <vector>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    int t;
+
+    cin >> t;
+
+    while (t--) {
+        int a, b, c, d;
+        std::vector<std::pair<char, int>> ans;
+
+        cin >> a >> b >> c >> d;
+
+        if ((a == 0 && b == -1) || (c == 0 && d == -1)) {
+            ans.emplace_back('B', 1);
+            std::swap(a, b), std::swap(c, d);
+            a = -a, c = -c;
+        } else if ((a == -1 && b == 0) || (c == -1 && d == 0)) {
+            ans.emplace_back('B', -1);
+            std::swap(a, b), std::swap(c, d);
+            b = -b, d = -d;
+        }
+
+        if (a == 0 && b == 1) {
+            if (d) ans.emplace_back('A', d);
+            ans.emplace_back('B', -1);
+        } else if (b == 0 && a == 1) {
+            ans.emplace_back('B', 1);
+            if (c) ans.emplace_back('A', c);
+            ans.emplace_back('B', -1);
+        } else if (c == 0 && d == 1) {
+            ans.emplace_back('A', -b);
+        } else {
+            ans.emplace_back('B', 1);
+            if (a) ans.emplace_back('A', -a);
+        }
+
+        std::reverse(ans.begin(), ans.end());
+
+        cout << ans.size() << endl;
+
+        for (auto o : ans) {
+            cout << o.first << ' ' << -o.second << endl;
+        }
+    }
+
+    return 0;
+}
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diff --git a/S2OJ/1556/data/Algebra10.ans b/S2OJ/1556/data/Algebra10.ans
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