import sys

def convert_unit(value, src_unit, dest_unit):	
	# write a docstring here by deleting this line    

	# your code starts here.
	result = -1
	
	return result # return the equivalent converted unit

if __name__ == "__main__":
    print("execuet your function below")

    # take input from command line
    value, src_unit, dest_unit = # command line input
    
    # call function convert_unit
    convert_unit(value, src_unit, dest_unit)


