diff --git a/desktop_version/src/UtilityClass.cpp b/desktop_version/src/UtilityClass.cpp
index 0aa941a9..f3e27eca 100644
--- a/desktop_version/src/UtilityClass.cpp
+++ b/desktop_version/src/UtilityClass.cpp
@@ -207,3 +207,15 @@ void UtilityClass::updateglow()
 		if (glow < 2) glowdir = 0;
 	}
 }
+
+bool is_positive_num(const std::string& str)
+{
+	for (size_t i = 0; i < str.length(); i++)
+	{
+		if (!std::isdigit(str[i]))
+		{
+			return false;
+		}
+	}
+	return true;
+}
diff --git a/desktop_version/src/UtilityClass.h b/desktop_version/src/UtilityClass.h
index 3d93680c..ea475cc1 100644
--- a/desktop_version/src/UtilityClass.h
+++ b/desktop_version/src/UtilityClass.h
@@ -11,6 +11,8 @@ std::vector<std::string> split(const std::string &s, char delim, std::vector<std
 
 std::vector<std::string> split(const std::string &s, char delim);
 
+bool is_positive_num(const std::string& str);
+
 
 //helperClass
 class UtilityClass