some stars are observed to be reddish and others blue. Which stars have ahigher surface temperature?

Stellar classification - Wikipedia, the free encyclopedia

"Most stars are currently classified using the letters O, B, A, F, G, K and M, where O stars are the hottest and the letter sequence indicates successively cooler stars up to the coolest M class. According to an informal tradition, O stars are "blue", B "blue-white", A stars "white", F stars "yellow-white", G stars "yellow", K stars "orange", and M stars "red", even though the actual star colors perceived by an observer may deviate from these colors depending on visual conditions and individual stars observed."

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In addition to Deco's post:
I'm not sure if you can consider stars as black bodies... if so, then check out Black body - Wikipedia, the free encyclopedia.
Edit: It seems that yes, you can consider stars as black bodies. Anyone please correct me if I'm wrong.

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Isaac
If the problem is too hard just let the Universe solve it.

i do not know, but the question appeared to me as a simple application of wiens displacement law (lambda max)*T=constant
so i think the star appearing blue will have a higher surface temperature.