diff --git a/solutions/python/1231C.py b/solutions/python/1231C.py
new file mode 100644
index 0000000..ca6b72c
--- /dev/null
+++ b/solutions/python/1231C.py
@@ -0,0 +1,55 @@
+import sys 
+
+n, m = map(int, input().split(' '))
+
+combined = []
+
+for _ in range(n):
+    cols = map(int, input().split(' '))
+
+    combined += cols
+
+combined = combined[::-1]
+
+def fail():
+    print("-1")
+    sys.exit()
+
+check = False
+for idx, i in enumerate(combined):
+    if i == 0:
+        placements = [combined[idx-m], combined[idx+m]]
+
+        if abs(placements[1]-placements[0]) == 1:
+            fail()
+
+        if abs(combined[idx+1]-combined[idx-1]) != 1:
+            if placements[0] != 0:
+                options = [
+                    combined[idx-m]-1,
+                    combined[idx-1]-1
+                ]
+
+                minimum = min(range(len(options)), key=lambda x: options[x])
+
+                if (abs(combined[idx-1]-combined[idx+m]) == 1) or (abs(combined[idx+1]-combined[idx-m]) == 1):
+                    print("-1")
+                    sys.exit()
+
+                if minimum == 1:
+                    combined[idx] = options[minimum]
+                elif minimum == 0:
+                    combined[idx] = placements[0]-1
+            else:
+                combined[idx] = combined[idx-1]-1
+        else:
+            fail()
+
+for i in range(0,len(combined)):
+    if (i+1) % m != 0 and (combined[i] <= combined[i+1]):
+        fail()
+    if i+m < len(combined):
+        if combined[i+m] >= combined[i]:
+            fail()
+
+print(sum(combined))