import random

def generateBoard():
    boardOne = ["-","-","-","-","-","x","o","-","-","o","x","-","-","-","-","-"]
    openMovesTurnOne=set()
    listDarks = []
    listLights = []
    darks=0
    lights=0
    i=0

    for i in range(16):
        if boardOne[i] == "x":
            listDarks.append(i)
            darks = darks+1
        if boardOne[i] == "o":
            listLights.append(i)
            lights = lights+1
        i=i+1

    print listDarks
    print listLights

    i=0
    j=0
    diff=0
    for i in range(darks):
        for j in range(lights):
            if (abs(listDarks[i] - listLights[j]) < 6):
                diff = abs(listDarks[i] - listLights[j]) # 1
                move = listLights[j] + diff # 7
                print move
                if boardOne[move] == "-":
                    openMovesTurnOne.add(move)
                diff = abs(listDarks[i] - listLights[j])
                move = listLights[j] - diff
                if boardOne[move] == "-":
                    openMovesTurnOne.add(move)
            j=j+1
        i=i+1

    print openMovesTurnOne



if __name__ == '__main__':
    generateBoard()