diff --git a/JEOH/11to20/11.py b/JEOH/11to20/11.py
new file mode 100644
index 0000000..25ceeb7
--- /dev/null
+++ b/JEOH/11to20/11.py
@@ -0,0 +1,14 @@
+def solution(s):
+    answer=0
+    stack=[]
+    for i in s:
+        if stack and stack[-1]==i:
+            stack.pop()
+        else:
+            stack.append(i)
+    if stack:
+        answer=0
+    else:
+        answer=1
+
+    return answer
\ No newline at end of file
diff --git a/JEOH/11to20/12.py b/JEOH/11to20/12.py
new file mode 100644
index 0000000..e69de29
diff --git a/JEOH/1to10/10.py b/JEOH/1to10/10.py
new file mode 100644
index 0000000..e69de29
diff --git a/JEOH/1to10/8.py b/JEOH/1to10/8.py
new file mode 100644
index 0000000..907c06c
--- /dev/null
+++ b/JEOH/1to10/8.py
@@ -0,0 +1,14 @@
+def solution(a):
+    stack=[]
+    for i in a:
+        if i=="(":
+            stack.append(i)
+        elif i==")":
+            if not stack:
+                return False
+            else:
+                stack.pop()
+    if stack:
+        return False
+    else:
+        return True
diff --git a/JEOH/1to10/9.py b/JEOH/1to10/9.py
new file mode 100644
index 0000000..d1d275f
--- /dev/null
+++ b/JEOH/1to10/9.py
@@ -0,0 +1,10 @@
+def solution(num):
+    stack=[]
+    while num>1:
+        a=num%2
+        num=num//2
+        stack.append(str(a))
+    stack.append(str(num))
+    stack.reverse()
+    bin=''.join(stack)
+    return bin
diff --git a/JEOH/81to90/81.py b/JEOH/81to90/81.py
new file mode 100644
index 0000000..e69de29
diff --git a/JEOH/91to100/91.py b/JEOH/91to100/91.py
new file mode 100644
index 0000000..e69de29
diff --git a/JEOH/91to100/92.py b/JEOH/91to100/92.py
new file mode 100644
index 0000000..e69de29
diff --git a/JEOH/91to100/93.py b/JEOH/91to100/93.py
new file mode 100644
index 0000000..e69de29
diff --git a/JEOH/91to100/94.py b/JEOH/91to100/94.py
new file mode 100644
index 0000000..e69de29