#include <bits/stdc++.h>

class kin{
public:
	inline void open(FILE *,int);
	inline void close(void);
	inline void scan(void);
	inline kin &operator>(char &);
	inline kin &operator>(int &);
	inline kin &operator>(long long &);
	inline kin &operator>(double &);
	inline kin &operator>(long double &);
	inline kin &operator>(char *);
	template<class T>
	inline void get(T *,int);
private:
	FILE *fp;
	char *buf;
	int siz;
	int idx;
}in;

class kout{
public:
	inline void open(FILE *,int);
	inline void close(void);
	inline void print(void);
	inline kout &operator<(char);
	inline kout &operator<(int);
	inline kout &operator<(long long);
	inline kout &operator<(double);
	inline kout &operator<(long double);
	inline kout &operator<(const char *);
	template<class T>
	inline void put(T *,int,char,char);
private:
	FILE *fp;
	char *buf;
	int siz;
	int idx;
}out;

template<class T,class A,class F,class G,class H>
class rrseg{
public:
	inline void open(int);
	inline void close(void);
	inline void put(int,int,A);
	inline T get(int,int);
	inline void set(int,T);
	inline void build(void);
	inline rrseg(T,A);
	inline rrseg(T,A,int);
private:
	int siz;
	int hgt;
	int node;
	T *dat;
	A *laz;
	T idt;
	A ida;
	F appf;
	G appg;
	H apph;
	inline T reflect(int,int);
	inline void update(int);
};

int main(int argc,char **argv){
	in.open(stdin,512);
	out.open(stdout,512);
	in.scan();
	struct fnf{inline int operator()(int chx,int chy){return chx<chy?chx:chy;}};
	struct fng{inline int operator()(int laz,int cnt,int dat){return laz;}};
	struct fnh{inline int operator()(int par,int ch){return par;}};
	int n;
	in>n;
	rrseg<int,int,fnf,fng,fnh> t(2147483647,2147483647,n);
	int q;
	in>q;
	for(int i=0;i<q;++i){
		int c,l,r;
		in>c>l>r;
		if(c==0){
			int x;
			in>x;
			t.put(l,r+1,x);
		}
		else out<t.get(l,r+1)<'\n';
	}
	t.close();
	out.print();
	in.close();
	out.close();
	return 0;
}

template<class T,class A,class F,class G,class H>
inline void rrseg<T,A,F,G,H>::open(int siza){
	siz=1;
	hgt=0;
	while(siz<siza){
		siz*=2;
		++hgt;
	}
	siz=siza;
	node=siz-1;
	int n=node+siz;
	dat=new T[n];
	laz=new A[n];
	for(int i=0;i<n;++i){
		dat[i]=idt;
		laz[i]=ida;
	}
	return;
}
template<class T,class A,class F,class G,class H>
inline void rrseg<T,A,F,G,H>::close(void){
	siz=hgt=node=0;
	delete[] dat;
	delete[] laz;
	dat=laz=nullptr;
	return;
}
template<class T,class A,class F,class G,class H>
inline void rrseg<T,A,F,G,H>::put(int first,int last,A val){
	update(first);
	update(last-1);
	int s=first+=node;
	int t=last+=node;
	while(first<last){
		if(!(first&1)) laz[first]=apph(val,laz[first]);
		if(!(last&1)){
			laz[last-1]=apph(val,laz[last-1]);
			--last;
		}
		first/=2;
		last/=2;
	}
	int hs=s<(1<<hgt)-1?hgt-1:hgt;
	for(int i=0;i<hs;++i){
		s=(s-1)/2;
		dat[s]=appf(reflect(s*2+1,1<<i),reflect(s*2+2,1<<i));
	}
	int ht=t<(1<<hgt)-1?hgt-1:hgt;
	for(int i=0;i<ht;++i){
		t/=2;
		dat[t-1]=appf(reflect(t*2-1,1<<i),reflect(t*2,1<<i));
	}
	return;
}
template<class T,class A,class F,class G,class H>
inline T rrseg<T,A,F,G,H>::get(int first,int last){
	update(first);
	update(last-1);
	first+=node;
	last+=node;
	T x=idt;
	int p=0;
	while(first<last){
		if(!(first&1)) x=appf(reflect(first,1<<p),x);
		if(!(last&1)) x=appf(reflect(--last,1<<p),x);
		first/=2;
		last/=2;
		++p;
	}
	return x;
}
template<class T,class A,class F,class G,class H>
inline void rrseg<T,A,F,G,H>::set(int num,T val){
	dat[num+node]=val;
	return;
}
template<class T,class A,class F,class G,class H>
inline void rrseg<T,A,F,G,H>::build(void){
	int d=node;
	for(int k=(1<<hgt-1)-1;k<d;++k) dat[k]=appf(dat[k*2+1],dat[k*2+2]);
	for(int i=hgt-2;i>=0;--i){
		int d=(1<<i+1)-1;
		for(int k=(1<<i)-1;k<d;++k) dat[k]=appf(dat[k*2+1],dat[k*2+2]);
	}
	return;
}
template<class T,class A,class F,class G,class H>
inline T rrseg<T,A,F,G,H>::reflect(int num,int cnt){
	return laz[num]!=ida?appg(laz[num],cnt,dat[num]):dat[num];
}
template<class T,class A,class F,class G,class H>
inline void rrseg<T,A,F,G,H>::update(int num){
	int k=0;
	int h=num+node<(1<<hgt)-1?hgt-1:hgt;
	for(int i=h-1;i>=0;--i){
		if(laz[k]!=ida){
			laz[k*2+1]=apph(laz[k],laz[k*2+1]);
			laz[k*2+2]=apph(laz[k],laz[k*2+2]);
			dat[k]=reflect(k,1<<i+1);
			laz[k]=ida;
		}
		k=k*2+1+(num+siz>>i&1);
	}
	return;
}
template<class T,class A,class F,class G,class H>
inline rrseg<T,A,F,G,H>::rrseg(T idta,A idaa){
	idt=idta;
	ida=idaa;
	siz=hgt=node=0;
	dat=laz=nullptr;
}
template<class T,class A,class F,class G,class H>
inline rrseg<T,A,F,G,H>::rrseg(T idta,A idaa,int siza){
	idt=idta;
	ida=idaa;
	open(siza);
}

inline void kin::open(FILE *fpa,int siza){
	fp=fpa;
	buf=new char[siza];
	siz=siza;
	idx=0;
	return;
}
inline void kin::close(void){
	fp=nullptr;
	delete[] buf;
	buf=nullptr;
	siz=0;
	idx=0;
	return;
}
inline void kin::scan(void){
	int readsiz=(int)std::fread((void *)buf,(std::size_t)1,(std::size_t)siz,fp);
	if(readsiz!=siz) buf[readsiz]='\x00';
	idx=0;
	return;
}
inline kin &kin::operator>(char &var){
	if(!buf[idx]){
		var='\x00';
		return *this;
	}
	var=buf[idx];
	if(++idx==siz) scan();
	if(++idx==siz) scan();
	return *this;
}
inline kin &kin::operator>(int &var){
	if(!buf[idx]){
		var=0;
		return *this;
	}
	int sign=-1;
	if(buf[idx]=='-'){
		sign=1;
		if(++idx==siz) scan();
	}
	var=0;
	while(buf[idx]>='0'){
		var=var*10-(int)(buf[idx]-'0');
		if(++idx==siz) scan();
	}
	var*=sign;
	if(++idx==siz) scan();
	return *this;
}
inline kin &kin::operator>(long long &var){
	if(!buf[idx]){
		var=0LL;
		return *this;
	}
	long long sign=-1LL;
	if(buf[idx]=='-'){
		sign=1LL;
		if(++idx==siz) scan();
	}
	var=0LL;
	while(buf[idx]>='0'){
		var=var*10LL-(long long)(buf[idx]-'0');
		if(++idx==siz) scan();
	}
	var*=sign;
	if(++idx==siz) scan();
	return *this;
}
inline kin &kin::operator>(double &var){
	if(!buf[idx]){
		var=0.0;
		return *this;
	}
	double sign=-1.0;
	if(buf[idx]=='-'){
		sign=1.0;
		if(++idx==siz) scan();
	}
	var=0.0;
	while(buf[idx]>='0'){
		var=var*10.0-(double)(buf[idx]-'0');
		if(++idx==siz) scan();
	}
	if(buf[idx]=='.'){
		if(++idx==siz) scan();
		double dig=1.0;
		while(buf[idx]>='0'){
			var-=(double)(buf[idx]-'0')*(dig/=10.0);
			if(++idx==siz) scan();
		}
	}
	var*=sign;
	if(++idx==siz) scan();
	return *this;
}
inline kin &kin::operator>(long double &var){
	if(!buf[idx]){
		var=0.0L;
		return *this;
	}
	long double sign=-1.0L;
	if(buf[idx]=='-'){
		sign=1.0L;
		if(++idx==siz) scan();
	}
	var=0.0L;
	while(buf[idx]>='0'){
		var=var*10.0L-(long double)(buf[idx]-'0');
		if(++idx==siz) scan();
	}
	if(buf[idx]=='.'){
		if(++idx==siz) scan();
		long double dig=1.0L;
		while(buf[idx]>='0'){
			var-=(long double)(buf[idx]-'0')*(dig/=10.0L);
			if(++idx==siz) scan();
		}
	}
	var*=sign;
	if(++idx==siz) scan();
	return *this;
}
inline kin &kin::operator>(char *var){
	if(!buf[idx]){
		var[0]='\x00';
		return *this;
	}
	int ptr=0;
	while(buf[idx]>='!'){
		var[ptr++]=buf[idx];
		if(++idx==siz) scan();
	}
	var[ptr]='\x00';
	if(++idx==siz) scan();
	return *this;
}
template<class T>
inline void kin::get(T *var,int num){
	for(int i=0;i<num;++i) (*this)>var[i];
	return;
}

inline void kout::open(FILE *fpa,int siza){
	fp=fpa;
	buf=new char[siza];
	siz=siza;
	idx=0;
	return;
}
inline void kout::close(void){
	fp=nullptr;
	delete[] buf;
	buf=nullptr;
	siz=0;
	idx=0;
	return;
}
inline void kout::print(void){
	std::fwrite((void *)buf,(std::size_t)1,(std::size_t)idx,fp);
	idx=0;
	return;
}
inline kout &kout::operator<(char val){
	buf[idx]=val;
	if(++idx==siz) print();
	return *this;
}
inline kout &kout::operator<(int val){
	if(val<0){
		buf[idx]='-';
		if(++idx==siz) print();
	}
	else val*=-1;
	char dig[10];
	int ptr=0;
	do{
		int tmp=val/10;
		dig[ptr++]=(char)-(val-tmp*10)+'0';
		val=tmp;
	}while(val);
	while(ptr--){
		buf[idx]=dig[ptr];
		if(++idx==siz) print();
	}
	return *this;
}
inline kout &kout::operator<(long long val){
	if(val<0LL){
		buf[idx]='-';
		if(++idx==siz) print();
	}
	else val*=-1LL;
	char dig[19];
	int ptr=0;
	do{
		long long tmp=val/10LL;
		dig[ptr++]=(char)-(val-tmp*10LL)+'0';
		val=tmp;
	}while(val);
	while(ptr--){
		buf[idx]=dig[ptr];
		if(++idx==siz) print();
	}
	return *this;
}
inline kout &kout::operator<(double val){
	if(val<0.0){
		buf[idx]='-';
		if(++idx==siz) print();
	}
	else val*=-1.0;
	double dig=1.0;
	while(val/dig<=-10.0) dig*=10.0;
	int tmp;
	while(dig>=1.0){
		buf[idx]=(char)-(tmp=(int)(val/dig))+'0';
		if(++idx==siz) print();
		val-=(double)tmp*dig;
		dig/=10.0;
	}
	buf[idx]='.';
	if(++idx==siz) print();
	for(int i=0;i<12;++i){
		buf[idx]=(char)-(tmp=(int)(val/dig))+'0';
		if(++idx==siz) print();
		val-=(double)tmp*dig;
		dig/=10.0;
	}
	return *this;
}
inline kout &kout::operator<(long double val){
	if(val<0.0L){
		buf[idx]='-';
		if(++idx==siz) print();
	}
	else val*=-1.0L;
	long double dig=1.0L;
	while(val/dig<=-10.0L) dig*=10.0L;
	int tmp;
	while(dig>=1.0L){
		buf[idx]=(char)-(tmp=(int)(val/dig))+'0';
		if(++idx==siz) print();
		val-=(long double)tmp*dig;
		dig/=10.0L;
	}
	buf[idx]='.';
	if(++idx==siz) print();
	for(int i=0;i<16;++i){
		buf[idx]=(char)-(tmp=(int)(val/dig))+'0';
		if(++idx==siz) print();
		val-=(long double)tmp*dig;
		dig/=10.0L;
	}
	return *this;
}
inline kout &kout::operator<(const char *val){
	for(int i=0;val[i];++i){
		buf[idx]=val[i];
		if(++idx==siz) print();
	}
	return *this;
}
template<class T>
inline void kout::put(T *val,int num,char spc,char end){
	--num;
	for(int i=0;i<num;++i) (*this)<val[i]<spc;
	(*this)<val[num]<end;
	return;
}



Measured memory_bytes: 4324