What poetic rhyme scheme is this poem using? please helpppppp!

For Hercules, victor of sovereign power, A
His labours sing his praise and lasting fame, B
Who in his time was human strength in flower. A
He slew a lion and he skinned the same; B
He robbed the Centaurs of their boasted name; B
He slew the Harpies, cruel birds and fell; C
He robbed the golden apples, overcame B
Their dragon-guard, drove Cerberus from Hell, C