diff --git a/12xxx/12174.cpp b/12xxx/12174.cpp
new file mode 100644
index 00000000..67de846d
--- /dev/null
+++ b/12xxx/12174.cpp
@@ -0,0 +1,29 @@
+#include <iostream>
+#include <string>
+using namespace std;
+
+void solve(int idx) {
+  int b; cin >> b;
+  string s; cin >> s;
+
+  cout << "Case #" << idx << ": ";
+  for (int i=0; i<8*b; i+=8) {
+    int x = 0;
+    for (int j=0; j<8; j++) {
+      x <<= 1;
+      x += (s[i+j] == 'I');
+    }
+    cout << (char)x;
+  }
+  cout << "\n";
+}
+
+int main(void) {
+  ios::sync_with_stdio(false);
+  cin.tie(nullptr);
+
+  int t; cin >> t;
+  cin.ignore();
+  for (int i=1; i<=t; i++) solve(i);
+  return 0;
+}
\ No newline at end of file