diff --git a/NFLSOJ/13356/13356.cpp b/NFLSOJ/13356/13356.cpp
new file mode 100644
index 00000000..a13f634b
--- /dev/null
+++ b/NFLSOJ/13356/13356.cpp
@@ -0,0 +1,63 @@
+#include <iostream>
+#include <algorithm>
+#include <fstream>
+#include <string>
+#include <utility>
+#include <vector>
+
+// using std::cin;
+// using std::cout;
+std::ifstream cin("rev.in");
+std::ofstream cout("rev.out");
+const char endl = '\n';
+
+std::string s, t;
+std::vector<std::pair<int, int>> ans;
+
+bool check() {
+    if (std::count(s.begin(), s.end(), '1') != std::count(t.begin(), t.end(), '1')) {
+        return false;
+    }
+
+    for (int i = 0; i < s.size(); i++) {
+        if (s[i] == t[i]) continue;
+
+        int cnt = 0;
+        bool flag = false;
+
+        for (int j = i; j < s.size(); j++) {
+            if (s[j] == '1') cnt++;
+
+            if (s[j] == t[i] && cnt % 2 == 0) {
+                flag = true;
+                ans.emplace_back(i + 1, j + 1);
+                std::reverse(s.begin() + i, s.begin() + j + 1);
+                break;
+            }
+        }
+
+        if (!flag) return false;
+    }
+
+    return true;
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    cin >> s >> t;
+
+    if (check()) {
+        cout << "YES" << endl
+             << ans.size() << endl;
+
+        for (auto e : ans) {
+            cout << e.first << ' ' << e.second << endl;
+        }
+    } else {
+        cout << "NO" << endl;
+    }
+
+    return 0;
+}
diff --git a/NFLSOJ/13356/samples/chk.cpp b/NFLSOJ/13356/samples/chk.cpp
new file mode 100644
index 00000000..833df6f0
--- /dev/null
+++ b/NFLSOJ/13356/samples/chk.cpp
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:927bdf6e2ddc3bca2c5ef12e7e17ba27f4a7d7fade9676b8bb2e6e15191c0578
+size 886
diff --git a/NFLSOJ/13356/samples/ex_rev1.ans b/NFLSOJ/13356/samples/ex_rev1.ans
new file mode 100644
index 00000000..25bcdabc
--- /dev/null
+++ b/NFLSOJ/13356/samples/ex_rev1.ans
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:41a3bca251cdfa049a930a7cbcd2ea5271e7e8bba96abb80a31aa9aca26dfdfb
+size 13
diff --git a/NFLSOJ/13356/samples/ex_rev1.in b/NFLSOJ/13356/samples/ex_rev1.in
new file mode 100644
index 00000000..0247d5e9
--- /dev/null
+++ b/NFLSOJ/13356/samples/ex_rev1.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d87a3d34a1b82f0c456882ef4719afc8c3c021fe5e2c73c823c4b38f82efd28c
+size 22
diff --git a/NFLSOJ/13356/samples/ex_rev2.ans b/NFLSOJ/13356/samples/ex_rev2.ans
new file mode 100644
index 00000000..ff83d47c
--- /dev/null
+++ b/NFLSOJ/13356/samples/ex_rev2.ans
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:4f1e37b4ecc384b4939c4a21fcf06548708ebd635a8494ab181b18625332a6e5
+size 4
diff --git a/NFLSOJ/13356/samples/ex_rev2.in b/NFLSOJ/13356/samples/ex_rev2.in
new file mode 100644
index 00000000..3ba9c6a9
--- /dev/null
+++ b/NFLSOJ/13356/samples/ex_rev2.in
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:a92364b46911bd4704ecf594c6affb395fab176845f562999409a2325f9742f3
+size 10