Operational Amplifier

Hi, I got the following problem for homework (attached), I solved it but wanted to double check the answer.

Please give it a try. Thanks.

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i think the noninverting input is A

apply a + vol to A and B grnd

as it is pnp the collector current prop to exp(vbe/vt) decreases say by dI
I biasing so , current thru B inc by dI

3A current source so current thru o/p trans of the second stage decreases by dI

VB-Vbe=constant at emitter of the o/p transistor of the second trans
so as current decreases Vce increases and o/p amp gain = +1 so o/p increases

+ at A => + at o/p
so A is non inverting