#include <bits/stdc++.h>
int main() {
std::ios::sync_with_stdio(false);
std::cin.tie(nullptr);
int n, m;
std::cin >> n >> m;
std::vector<int> l(m + 1);
std::vector<int> r(m + 1);
std::vector<int> k(m + 1);
std::vector<int> v(m + 1);
std::vector<int> ans(n, -1);
int ok = 1;
for(int i = 1; i <= m; i++) {
std::cin >> l[i] >> r[i] >> k[i] >> v[i];
assert(k[i] == 1);
if(v[i] == 1) {
for(int j = l[i]; j <= r[i]; j++) {
if(ans[j] != - 1) {
ok = 0;
break;
}
ans[j] = v[i];
}
}
else {
int found = 0;
for(int j = l[i]; j <= r[i]; j++) {
if(!ans[j]) {
found = 1;
break;
}
}
if(found) {
continue;
}
for(int j = l[i]; j <= r[i]; j++) {
if(ans[j] == - 1) {
found = 1;
ans[j] = 0;
break;
}
}
if(!found) {
ok = 0;
}
}
}
if(!ok) {
std::cout << - 1;
return 0;
}
for(int i = 0; i < n; i++) {
if(ans[i] == - 1) {
ans[i] = 0;
}
std::cout << ans[i] << " "[i == n - 1];
}
}
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