def determine_year_level():
    year_levels ={
        1:"Freshmen",
        2:"Sophomore",
        3:"Junior",
        4:"Senior"
    }
    year_input = input("Enter the number representing your year (1-Freshmen, 2-Sophomore, 3-Junior, 4-Senior): ")
    
    try:
        year_input = int(year_input)
        if year_input in year_levels:
            print(f"You are a {year_levels[year_input]}!")
        else:
            print("Invalid input. Please enter a number from 1 to 4.")
    except ValueError:
        print("Invalid input. Please enter a number.")
        
determine_year_level()