#include<bits/stdc++.h>
using namespace std;
const int N = 1e6+10;
int n,m,num,cnt;
int trie[N*24][2],val[N*24];
int s[N],root[N];
inline int read()
{
    int x = 0, f = 1; char c; c = getchar();
    while(!isdigit(c)){if(c=='-')f=-1;c=getchar();}
    while(isdigit(c)){x=x*10+c-48;c=getchar();}
    return x*f;
}
void insert(int pre,int &cur,int len,int i)
{
    if(cur==0) cur=++cnt;
    val[cur] = i;
    if(len<0) return;
    bool c = (s[i]>>len)&1;
    trie[cur][c^1] = trie[pre][c^1];
    insert(trie[pre][c],trie[cur][c],len-1,i);
}
int find(int l,int cur,int len,int v)
{
    if(len<0)return s[val[cur]]^v;
    int c=(v>>len)&1;
    if(val[trie[cur][c^1]]>=l) return find(l,trie[cur][c^1],len-1,v);
    return find(l,trie[cur][c],len-1,v);
}
int main()
{
    n = read(); m = read();
    val[0]=-1;
    insert(0,root[0],23,0);
    for(int i = 1,v; i <= n; ++i)
    {
        v = read(); s[i]=s[i-1]^v;
        insert(root[i-1],root[i],23,i);
    }
    num = n;
    for(int i = 1; i <= m; ++i)
    {
        char opt[2]; scanf("%s",opt);
        if(opt[0]=='A')
        {
            int x = read();s[++num]=s[num-1]^x;
            insert(root[num-1],root[num],23,num);
        }
        else
        {
            int l = read(), r = read(), x = read();
            printf("%d\n",find(l-1,root[r-1],23,x^s[num]));
        }
    }
}