What value is returned by the function call great $(21,35)?$

def great $(a,b)$ :

while $a0$ and $b,$ :

if $a>b$ :

$a=a-b$

else:

$b=b-a$

return max$(a,b)$

What value is returned by the function call great $(21,35)?$

def great $(a,b)$ :

while $a$ and $b,$ :

if $a>b$ :

$a=a-b$

else:

$b=b-a$

return max$(a,b)$