The extra digit is because using the Element.Name node for Rooms produces Room Name + Room Number. Replace the Element.Name node with Element.GetParameterValueByName with the parameterName input as “Name” and it will exclude that extra digit:
In this case, though, it seems more like the rooms’ names should be “UNIT” and their numbers should be 101, 102. If 101 and 102 were set as the rooms’ numbers (as pictured below) you could use the room number parameter value instead of room name, and eliminate the need for String.Remove on the Room Name parameter value:
