diff --git a/du4/program.c b/du4/program.c
index c12b6dc..4fd753e 100644
--- a/du4/program.c
+++ b/du4/program.c
@@ -1,3 +1,6 @@
+/*
+gcc -Werror -std=c11  -Wall  in-out.c   -lm   -o in-out -lm && ./in-out
+*/
 #include <stdio.h>
 #include <stdarg.h>
 #include <stdlib.h>
@@ -45,9 +48,9 @@ int main(){
         if(cond<0){
             printf("CHYBA\n");
             return 0;}
-        /*if((fcond=checkend())!='\n'){
-            printf("1CHYBA %d\n",(int)fcond);
-            return 0;}*/
+        if((fcond=checkend())!='\n' && fcond>0){
+            printf("CHYBA\n");
+            return 0;}
         if(fcond==-1)
             break;
         //printf("%lf %c %lf = %lf\n",list[i].na,list[i].sign,list[i].nb,list[i].result);
@@ -70,8 +73,15 @@ char checkend(void){
     while((c=getchar())){
         ++count;
         if(c==EOF || c=='\n'){
+            int a=c;
+            if((c=getchar())==EOF){
+                ++count;
+                fseek(stdin,-count,SEEK_CUR);    
+                return c;
+            }
+            ++count;
             fseek(stdin,-count,SEEK_CUR);
-            return c;
+            return a;
         }
         else if(!isspace(c)){
             fseek(stdin,-count,SEEK_CUR);