#include <cstdio>
#include <vector>
#include <algorithm>
#define INF "radiatie.in"
#define OUF "radiatie.out"
#define pb push_back
#define sz(arg) arg.size()


using namespace std;
const int NMAX=16002;
const int MMAX=30002;
const int BIG=2000000000;

struct arc
{
	short x,y;
	int l;
};
struct arc2
{
	short nb;
	int l;
};

short n,m,k,niv[NMAX]={0},cc[NMAX]={0},t[NMAX]={0};
int lng[NMAX]={0};
char viz[NMAX]={0};

vector<arc2> a[NMAX];//ARBORE
vector<arc> ed;

bool cmp(arc alfa,arc beta) {return (alfa.l<beta.l);}

void apm()
{
	sort(ed.begin(),ed.end(),cmp);
	short i,j,nbx,nby,nr,aux;
	arc2 ab;
	
	for(i=1;i<=n;++i)	cc[i]=i;//componenta conexa in care este i

	i=0;nr=n-1;
	while(nr>0&&i<m)
	{
		while(i<m&&cc[ed[i].x]==cc[ed[i].y]) ++i;
		nbx=ed[i].x;nby=ed[i].y;
		ab.l=ed[i].l;
		ab.nb=nby;a[nbx].push_back(ab);
		ab.nb=nbx;a[nby].push_back(ab);

		//printf("%hd %hd\n",nbx,nby);
		aux=cc[nby];
		for(j=1;j<=n;++j)
		{
			//printf("%hd ",cc[j]);
			if(cc[j]==aux) cc[j]=cc[nbx];
		//	printf("%hd ",cc[j]);
		}
//		printf("\n");
		--nr;
	}
}

void dfs(short nd,short lev)
{
	short i,nb;
	viz[nd]=1;niv[nd]=lev;
	for(i=0;i<sz(a[nd]);++i)
	if(!viz[a[nd][i].nb]) 
	{
		nb=a[nd][i].nb;
		t[nb]=nd;lng[nb]=a[nd][i].l;
		dfs(nb,lev+1);
	}
}

int query(short x,short y)
{
	int mx=-1;
	short i,j;
	i=x;j=y;
	if(niv[i]>niv[j])
	{
		while(i>1&&niv[i]>niv[j])
		{
			mx=max(mx,lng[i]);
			i=t[i];
		}
	}
	else
	{
		while(j>1&&niv[j]>niv[i])
		{
			mx=max(mx,lng[j]);
			j=t[j];
		}
	}

	while(i>1&&i!=j)
	{
		mx=max(mx,lng[i]);
		mx=max(mx,lng[j]);
		i=t[i];j=t[j];
	}

	return mx;
}

int main()
{
	FILE *in,*out;
	in=fopen(INF,"r");
	out=fopen(OUF,"w");
	short i,j,alfa,beta;
	int v;
	arc x;
	fscanf(in,"%hd%hd%hd",&n,&m,&k);
	for(i=0;i<m;++i)
	{
		fscanf(in,"%hd%hd%d",&x.x,&x.y,&x.l);
		ed.push_back(x);
	}

	apm();
	//for(i=0;i<=n;++i) lng[i]=BIG;
	dfs(1,1);
	
	for(i=1;i<=n;++i) if(sz(a[i])<1) printf("%c",viz[BIG]);// printf("%d ",lng[i]);
	
	for(i=1;i<=k;++i)
	{
		fscanf(in,"%hd%hd",&alfa,&beta);
		v=query(alfa,beta);
		fprintf(out,"%d\n",v);
//		if(v<1) while(1);
	}
	
	fclose(in);fclose(out);
	return 0;
}