def search(a,x):
res=[]
for i in range(len(x)):
if x[i]==a:
res+=[i]
if len(res)>0:
print("Нашли под номерами "+str(res))
else:
print("Не нашли")
arr=[1,2,3,1,2,3,1,2,3]
search(3,arr)
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