Python,巧用Try,Except

while True:
    try:
        string = input().strip().split(';')
        start = [0, 0]
        for i in string:
            if not i: continue
            try:
                if i[0] == 'A':
                    start[0]-=int(float(i[1:]))
                if i[0] == 'D':
                    start[0]+=int(float(i[1:]))
                if i[0] == 'S':
                    start[1]-=int(float(i[1:]))
                if i[0] == 'W':
                    start[1]+=int(float(i[1:]))
            except:
                continue
        print('%d,%d'%(start[0],start[1]))
    except:
        break