diff --git a/boj/16953.py b/boj/16953.py
new file mode 100644
index 0000000..a49d796
--- /dev/null
+++ b/boj/16953.py
@@ -0,0 +1,16 @@
+a,b=map(int,input().split())
+count=0
+
+while a<b:
+    if b%2==0:
+        b//=2
+    elif b%10==1:
+        b//=10
+    else:
+        break
+    count+=1
+
+if a==b:
+    print(count+1)
+else:
+    print(-1)