diff --git a/du4/program.c b/du4/program.c
index 9a243f0..53c882e 100644
--- a/du4/program.c
+++ b/du4/program.c
@@ -25,11 +25,18 @@ int main() {
 	break;
 	}
 	for (int i = 0; i < strlen(znaky); i++) {  
-	if (znaky[i] == '*' || znaky[i] == '/' || znaky[i] == '-' || znaky[i] == '+' || znaky[i] == '=') {
+	if (znaky[i] == '*' || znaky[i] == '/' || znaky[i] == '+' || znaky[i] == '=') {
                 symbol[sym] = znaky[i];
                 znaky[i] = ' ';
                 sym++;
         }
+		if(znaky[i] == '-'){
+			if(znaky[i - 1] == ' ' && znaky[i + 1] == ' '){
+			symbol[sym] = znaky[i];
+			znaky[i] = ' ';
+			sym++;
+			}
+		}
         }
         zaciatok_cisla = znaky;
         while (*zaciatok_cisla != '\0') {
@@ -52,19 +59,24 @@ int main() {
             }
         }
     }
-	if(symbol[sym - 2] == '+'){
+	int p = 0;
+	for(int j = 0; j < sym; j++){
+	if(symbol[j] == '=')
+	p = j;
+	}
+        if(symbol[p - 1] == '+'){
 	sr = a + b; 
 	//printf("%2.f", sr);
 	}
-	if(symbol[sym - 2] == '-'){
+	if(symbol[p - 1] == '-'){
 	sr = a - b; 
 	//printf("%2.f", sr);
 	}
-	if(symbol[sym - 2] == '*'){
+	if(symbol[p - 1] == '*'){
 	sr = a * b; 
 	//printf("%2.f", sr);
 	}
-	if(symbol[sym - 2] == '/'){
+	if(symbol[p - 1] == '/'){
 	sr = a / b; 
 	//printf("%2.f", sr);
 	}