Task C

n, s = input().split(" ")
a = {}
d = {}
z = []
for i in range(int(n)):
    a.update({str(i+1): {}})
    d.update({str(i+1): {}})
for i in range(int(s)):
    zap = input().split(" ")
    if zap[0] == "+" :
        a[zap[1]].update({zap[2]: 0})
        a[zap[2]].update({zap[1]: 0})
        lol=list(set(a[zap[1]]))
        for i in range(len(lol)):
            a[lol[i]].update({zap[2]: 0})
        lol = list(set(a[zap[2]]))
        for i in range(len(lol)):
            a[lol[i]].update({zap[1]: 0})
    elif zap[0] == "-":
        d[zap[1]].update({zap[2]: 0})
        d[zap[2]].update({zap[1]: 0})
        lol = list(set(a[zap[1]]))
        for i in range(len(lol)):
            d[lol[i]].update({zap[2]: 0})
        lol = list(set(a[zap[2]]))
        for i in range(len(lol)):
            d[lol[i]].update({zap[1]: 0})
        d[zap[2]].update(a[zap[1]])
        d[zap[1]].update(a[zap[2]])
    elif(zap[0] == "?"):
        if(set(a[zap[1]])&set(zap[2])!=set() and set(d[zap[1]])&set(zap[2])==set()):
            z.append("+")
        elif(set(d[zap[1]])&set(zap[2])!=set()):
            z.append("-")
        else:
            z.append("?")
for i in range(len(z)):
    print(z[i])