4.3

def find_bigest(arr):
    if(len(arr) == 1):
        return arr[0]
    if(arr[0] > arr[-1]):
        return find_bigest(arr[:-1])
    else:
        return find_bigest(arr[1:])

_ = [1,45,467,123,8,2,63,]

print(find_bigest(_))