How many years passed from when Germany made a last attempt on the Western Front to when President Roosevelt died and was succeeded by Harry S. Truman
return Germany made a last attempt on the  Western Front ;return President Roosevelt died and  was  succeeded by Harry S. Truman ;return year of #1 ;return year of #2 ;return difference of #4 and  #3
['select', 'select', 'project', 'project', 'arithmetic']