str1=str(input())
if(str1.isnumeric()==True):
 print("yes")
else :
 print("No")

c02b3e7df42a5b0815fce18c08b26ad222b42af9
<mask token>

<mask token>
if str1.isnumeric() == True:
    print('yes')
else:
    print('No')

str1 = str(input())
if str1.isnumeric() == True:
    print('yes')
else:
    print('No')

str1=str(input())
if(str1.isnumeric()==True):
 print("yes")
else :
 print("No")
