j=eval(input("enter a number"))
i=1
while(i<=j):
    print(i," ",j)
    i=i+1
    j=j-1
print(i," ",j)

42fb2fc54e405ce7ddd4a6d7402d117dbdb1a129
<mask token>

<mask token>
while i <= j:
    print(i, ' ', j)
    i = i + 1
    j = j - 1
print(i, ' ', j)

j = eval(input('enter a number'))
i = 1
while i <= j:
    print(i, ' ', j)
    i = i + 1
    j = j - 1
print(i, ' ', j)

j=eval(input("enter a number"))
i=1
while(i<=j):
    print(i," ",j)
    i=i+1
    j=j-1
print(i," ",j)
