for(int i = 1;i <= n;i ++){
		char op;
		int x,y;
		scanf("%c",&op);//把这个改成cin就没事了神马东东
		x = read(),y = read();
		if(op == 'M'){
			join(x,y);
		}
		else {
			int xx = find(x);
			int yy = find(y);
			if(xx != yy)printf("-1\n");
			else {
				int ans = abs(dis[x] - dis[y]) - 1;
				printf("%lld\n",abs(dis[x] - dis[y]) - 1);
			}
		}
	}