diff --git a/dz9.2 b/dz9.2
new file mode 100644
index 0000000..9e4d907
--- /dev/null
+++ b/dz9.2
@@ -0,0 +1,50 @@
+#include <stdio.h>
+#include <string.h>
+#include <ctype.h>
+#define N 100
+
+
+int check(char* s)
+{
+  int count = 0;
+  int res;
+
+  for (size_t i = 0; i < strlen(s); i++)
+  {
+    if(isdigit(s[i]))
+    {
+      count += (int)s[i] - 48;
+    }
+  }
+
+  if (count == strlen(s))
+  {
+    res = 1;
+  }
+  else
+  {
+    res = 0;
+  }
+
+  return res;
+}
+
+
+int main()
+{
+   char* s = malloc(sizeof(char) * N);
+
+   printf("Enter a string to reverse: ");
+   gets(s);
+
+   if (check(s) == 1)
+   {
+     printf("ok");
+   }
+   else
+   {
+     printf("not ok");
+   }
+
+   return 0;
+}