def LA4(n = 5):
    from random import sample
    from matplotlib import pyplot as plt
    piece = ('pile', 'face')
    posisAgnX = [0] ; posisAgnY = [0]
    posisLoupX = [n] ; posisLoupY = [n]
    rencontre = 0
    for i in range(0, n):
        tirAgn = sample(piece, 1)
        depAgn = int(tirAgn[0] == 'pile')
        if (depAgn == 1):
            posisAgnX.append(posisAgnX[-1] + 1)
            posisAgnY.append(posisAgnY[-1])
        else:
            posisAgnY.append(posisAgnY[-1] + 1)
            posisAgnX.append(posisAgnX[-1])
        tirLoup = sample(piece, 1)
        depLoup = int(tirLoup[0] == 'pile')
        if (depLoup == 1):
            posisLoupX.append(posisLoupX[-1] - 1)
            posisLoupY.append(posisLoupY[-1])
        else:
            posisLoupY.append(posisLoupY[-1] - 1)
            posisLoupX.append(posisLoupX[-1])
    if ((posisAgnX[-1] == posisLoupX[-1]) & (posisAgnY[-1] == posisLoupY[-1])):
        rencontre = 1
        print('Rencontre en (', posisAgnX[-1], ';', posisAgnY[-1], ')')
    else:
        print('Pas de rencontre')