diff --git a/src/inputHandler.c b/src/inputHandler.c
index 107b9df..0ecd1d6 100644
--- a/src/inputHandler.c
+++ b/src/inputHandler.c
@@ -1,4 +1,5 @@
 #include "inputHandler.h"
+#include <string.h>
 
 int getOperationId(char symbol) {
     int id = 0;
@@ -41,3 +42,8 @@ char getOperationSymbol(int id) {
     }
     return symbol;
 }
+
+int isOperationValid(int id) {
+    if(id < 0 || id > 7) return 0;
+    return 1;
+}
\ No newline at end of file
diff --git a/src/inputHandler.h b/src/inputHandler.h
index 98f1421..107f49e 100644
--- a/src/inputHandler.h
+++ b/src/inputHandler.h
@@ -5,4 +5,6 @@ int getOperationId(char);
 
 char getOperationSymbol(int);
 
+int isOperationValid(int);
+
 #endif //THEADMIRALS_INPUTHANDLER_H