diff --git a/a1/program.c b/a1/program.c
index 1cb7384..28d47d3 100644
--- a/a1/program.c
+++ b/a1/program.c
@@ -4,7 +4,49 @@
 #include <stdbool.h>
 #include <math.h>
 
+bool check_spaces(const char* str) {
+    int len = strlen(str);
+    bool is_operator = false; 
+    bool is_operand = false;  
+
+    for (int i = 0; i < len; ++i) {
+        char current_char = str[i];
+        
+        
+        if (current_char == ' ') {
+            if (!is_operator && !is_operand) {
+                return false;
+            }
+        }
+        
+        else if (current_char >= '0' && current_char <= '9') {
+            is_operand = true;
+            is_operator = false;
+        }
+        
+        else if (current_char == '+' || current_char == '-' || current_char == '*' || current_char == '/') {
+            is_operator = true;
+            is_operand = false;
+        }
+        
+        else {
+            return false;
+        }
+    }
+
+    
+    if (!is_operand) {
+        return false;
+    }
+
+    return true;
+}
+
 char* check_math_problem(const char* problem) {
+    if (!check_spaces(problem)) {
+        return "ZLE";
+    }
+
     if (strlen(problem) == 0) {
         return "CHYBA";
     }
@@ -16,6 +58,10 @@ char* check_math_problem(const char* problem) {
         return "CHYBA";
     }
 
+    if (equel != '=') {
+        return "CHYBA";
+    }
+
     double result;
     switch (sing) {
         case '+':
@@ -57,3 +103,8 @@ int main() {
 
     return 0;
 }
+
+
+
+
+