Amalgamated Marks

t = [0 for _ in range(50)]

# array of marks goes here
a = [ "1:6", "2:2", 5, 5, 5, -5, -15, 10 ]

for m in a:
    if ':' in str(m):
        m, p = m.split(':', 1)
        t[int(m)] += int(p)
    else:
        if m > 0:
            t[m] = += 1
        else:
            t[abs(m)] -= 1

for x in range(50):
    print (str(x) + ", " + str(t[x]))