def somme(p, q):
    d = len(p) - len(q)
    if d < 0:
        for i in range(abs(d)):
            p.append(0)
    else:
        for i in range(d):
            q.append(0)
    r = []
    for i in range(len(p)):
        coeff = p[i] + q[i]
        r.append(coeff)
    return r

def difference(p, q):
    d = len(p) - len(q)
    if d < 0:
        for i in range(abs(d)):
            p.append(0)
    else:
        for i in range(d):
            q.append(0)
    r = []
    for i in range(len(p)):
        coeff = p[i] - q[i]
        r.append(coeff)
    return r


##Contexte d'execution
p = [-2, 3]
q = [3, -5, -4, 5]
print(somme(p, q))
print(somme(q, p))
print(difference(p, q))
print(difference(q, p))