diff --git a/du3/program.c b/du3/program.c
index e99e81f..59f088b 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -89,18 +89,13 @@ int main()
         char input[1000];
         while (fgets(input,sizeof(input),stdin)!=NULL)
         {
-		if((input[0]>='A' && input[0]<='Z') || (input[0]>='a' && input[0]<='z'))
+		if((input[0]>=0 && input[0]<=47) || (input[0]>=58 && input[0]<=127))
 		{
 			printf("bad input\n");
 			return 0;
 		}	
             int flag=switch_operators(input);
             input[strcspn(input,"\n")]=0;
-            if (strlen(input)==0 || input[0]==' ') 
-            {
-				printf("no input\n");
-                continue;
-            }
             if (flag==0 || flag==-1)
             {
 			if(flag==-1 && mystack.values[mystack.size-1]==0)