#include <bits/stdc++.h>
using namespace std;
int n, m; vector<char> A; vector<int> in[20005];
void set0(vector<char> &X, int i){
X[i] = '0';
for (auto nxt : in[i]) if (X[nxt] != '0') set0(X, nxt);
}
bool can(vector<char> &X){
for (int i = n; i < n + m; i++){
char &in1 = X[in[i][0]], &in2 = X[in[i][1]], &cur = X[i];
if (in1 == '0' and in2 == '0') cur = '0';
else if (in1 == '1' or in2 == '1') cur = '1';
if (A[i] != '?' and cur != A[i]) return 0;
}
return 1;
}
int main(){
cin >> n >> m; A.resize(n + m);
for (int i = 0; i < n + m; i++){
if (i < n) A[i] = '?';
else cin >> A[i];
}
for (int i = n, u, v; i < n + m; i++){
string a, b; cin >> a >> b;
u = stoi(a.substr(1)) + (a[0] == 'c' ? n : 0);
v = stoi(b.substr(1)) + (b[0] == 'c' ? n : 0);
in[i].push_back(u - 1); in[i].push_back(v - 1);
}
for (int i = n; i < n + m; i++) if (A[i] == '0') set0(A, i);
for (int i = n; i < n + m; i++){
if (A[i] == '?'){
vector<char> tmp0 = A, tmp1 = A; bool ok0, ok1;
set0(tmp0, i); tmp1[i] = '1';
A[i] = '0'; ok0 = can(tmp0);
A[i] = '1'; ok1 = can(tmp1);
A[i] = '?';
cout<<((ok0 and ok1) ? "?" : to_string(ok1));
}
else cout<<A[i];
}
}
