push(ladybug): successful
list: ladybug
pop: ladybug
list:
push(cat): successful
push(dog): successful
push(pig): successful
push(cow): successful
list: cow pig dog cat
size: 4
capacity: 4
peek(1): pig
peek(-1): Failure due to exception: "Peek index out of range"
push(frog): successful
list: frog cow pig dog cat
size: 5
capacity: 8
