1 files changed, 15 insertions, 0 deletions
diff --git a/progs/a170.py b/progs/a170.py
new file mode 100644
index 0000000..2c39536
--- /dev/null
+++ b/progs/a170.py
@@ -0,0 +1,15 @@
+from collections import deque
+def check_expression(exp):
+    if len(exp) & 1:
+        return False
+    stack = deque()
+    for ch in exp:
+        if ch == '(' or ch == '{' or ch == '[':
+            stack.append(ch)
+        if ch == ')' or ch == '}' or ch == ']':
+            if not stack:
+                return False
+            top = stack.pop()
+            if (top == '(' and ch != ')') or (top == '{' and ch != '}' or (top == '[' and ch != ']')):
+                return False
+    return not stack
+\ No newline at end of file