diff --git a/67-240525-pass/main.py b/67-240525-pass/main.py
new file mode 100644
index 0000000..4a9979f
--- /dev/null
+++ b/67-240525-pass/main.py
@@ -0,0 +1,33 @@
+class Solution:
+    def addBinary(self, a: str, b: str) -> str:
+        tmpa = a
+        tmpb = b
+        if len(a)>len(b):
+            a = tmpb
+            b = tmpa
+        while len(a) < len(b): a = '0' + a
+        print(a, b)
+        flag = 0
+        indb = len(b) - 1
+        rlt = ""
+        for inda in range(len(a)-1, -1, -1):
+            numa = int(a[inda])
+            numb = int(b[indb])
+            s = numa + numb + flag
+            print(s)
+            if s == 3:
+                rlt = '1' + rlt
+                flag = 1
+            if s == 2:
+                flag = 1
+                rlt = '0' + rlt
+            if s == 1: 
+                flag = 0
+                rlt = '1' + rlt
+            if s == 0: 
+                flag = 0
+                rlt = '0' + rlt
+            indb -= 1
+            print(f'rlt: {rlt}')
+        if flag == 1: rlt = '1' + rlt
+        return rlt
\ No newline at end of file