try:
num=[]
for a in range(0,1000000):
num.append(1)
num[0]=0
num[1]=0
n=2
for b in range(2,1000000):
c=int(b)
if num[b]==1:
while c*n<1000000:
num[c*n]=0
b=c*n
n+=1
n=2
while 1:
num_input=int(input())
if num[num_input]==1:
print(num_input,'is a primary number')
else:
print(num_input,'is a ordinary number')
except:
print('ERROR')
//Please tell me how to do
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