Нужна помощь по Python задача "Оркестр"

 musicians = [] 
while True: 
    musician = input() 
    if musician == '': 
        break 
    musicians.append(musician) 
 
goboe = set() 
flute = set() 
saxophone = set() 
 
for musician in musicians: 
    if musician not in goboe and musician not in flute and musician not in saxophone: 
        goboe.add(musician) 
    elif musician not in goboe and musician not in saxophone: 
        flute.add(musician) 
    elif musician not in flute: 
        saxophone.add(musician) 
 
print('Музыканты, играющие только на гобое:', goboe) 
print('Музыканты, играющие только на флейте:', flute) 
print('Музыканты, играющие только на саксофоне:', saxophone) 

  
x=[] 
for i in range(3): 
    while True: 
        a=input() 
        if a!='': 
            x.append(a) 
        else: 
            break 
name=[] 
for i in x: 
    if x.count(i)==1: 
        name.append(i) 
print(*name, sep='\n')