lkjgfksdaf

//author: JainBot27
//Created on: 08/31/20
#pragma GCC optimize("Ofast")
#pragma GCC target("sse4,avx,avx2,fma")
#include <bits/stdc++.h>
using namespace std;


#define f first
#define s second
#define pb push_back
#define mp make_pair
#define ts to_string
#define ub upper_bound
#define lb lower_bound
#define ar array
#define all(x) x.begin(), x.end()
#define siz(x) (int)x.size()
#define FOR(x, y, z) for(int x = (y); x < (z); x++)
#define ROF(x, y, z) for(int x = (y-1); x >= (z); x--)
#define F0R(x, z) FOR(x, 0, z)
#define R0F(x, z) ROF(x, z, 0)
#define trav(x, y) for(auto&x:y)


const string nl = "\n";
using ll = int64_t;
using vi = vector<int>;
using vl = vector<ll>;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using str = string;
using vpii = vector<pii>;
using vpll = vector<pll>;


template<class T> inline bool ckmin(T&a, T b) {return b < a ? a = b, 1 : 0;}
template<class T> inline bool ckmax(T&a, T b) {return b > a ? a = b, 1 : 0;}
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());


str ts(char c) { return str(1,c); }
str ts(bool b) { return b ? "true" : "false"; }
str ts(const char* s) { return (str)s; }
str ts(str s) { return s; }
template<class A> str ts(complex<A> c) {
    stringstream ss; ss << c; return ss.str(); }
str ts(vector<bool> v) {
    str res = "{"; for(int i = 0;i < (int)v.size(); i++) res += char('0'+v[i]);
    res += "}"; return res; }
template<size_t SZ> str ts(bitset<SZ> b) {
    str res = ""; for(int i = 0; i < b.size(); i++) res += char('0'+b[i]);
    return res; }
template<class A, class B> str ts(pair<A,B> p);
template<class T> str ts(T v) {
    bool fst = 1; str res = "{";
    for (const auto& x: v) {
        if (!fst) res += ", ";
        fst = 0; res += ts(x);
    }
    res += "}"; return res;
}
template<class A, class B> str ts(pair<A,B> p) {
    return "("+ts(p.f)+", "+ts(p.s)+")"; }
void DBG() { cerr << "]" << endl; }
template<class H, class... T> void DBG(H h, T... t) {
    cerr << ts(h); if (sizeof...(t)) cerr << ", ";
    DBG(t...); }


#ifdef D
#define dbg(...) cerr << "LINE(" << __LINE__ << ") -> [" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
#else
#define dbg(...) 0
#endif

const int mxN = 2e5 + 10;
vi adj[mxN], radj[mxN], o; int ctr, ans[mxN], scc[mxN], vis[mxN], n, m;

void dfs(int u){
    vis[u] = 1;
    trav(v, adj[u]){
        if(!vis[v])
            dfs(v);
    }
    o.pb(u);
}
void dfs2(int u){
    scc[u] = ctr;
    vis[u] = 1;
    trav(v, radj[u]){
        if(!vis[v])
            dfs2(v);
    }
}
signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin >> n >> m;
    for(int i=0; i < n; i++){
        char c1, c2; int u1, u2; cin >> c1 >> u1 >> c2 >> u2;
        u1--; u2--;
        u1*=2; u2*=2;
        if(c1=='-') u1++;
        if(c2=='-') u2++;
        adj[u1^1].pb(u2);
        adj[u2^1].pb(u1);
    }
    for(int i=0; i < 2*m; i++){
        trav(v, adj[i]){
            radj[v].pb(i);
        }
    }
    for(int i=0; i < 2*m; i++){
        if(!vis[i])
            dfs(i);
    }
    assert(siz(o)==2*m);
    reverse(all(o));
    memset(vis, 0, sizeof(vis));
    for(int i=0; i < 2*m; i++){
        int x=o[i];
        if(!vis[x]){
            dfs2(x);
            ctr++;
        }
    }
    for(int i=0; i < m; i++){
        //cerr << scc[2*i] << " " << scc[2*i+1] << nl;
        if(scc[2*i]==scc[2*i+1]){
            cout << "IMPOSSIBLE" << nl;
            return 0;
        }
        ans[i] = scc[2*i+1] > scc[2*i];
    }
    for(int i=0; i < m; i++){
        cout << (ans[i]?'-':'+') << " ";
    }
}

/*
 * Stuff I should try:
 * Is it Monotonic? -> Binary Search
 * Is N small? -> Bitsets or other exponential
 * Edge Cases? Look Carefully
 * Can't figure anything out? Brute Force and see patterns
 * Try to prove greedies
 * Prefix Sums, Amortization, DP, Data Structures
*/