import sys
#input = sys.stdin.readline
#input = sys.stdin.buffer.readline #文字列はダメ
#sys.setrecursionlimit(1000000)
#import bisect
#import itertools
#import random
#from heapq import heapify, heappop, heappush
#from collections import defaultdict 
#from collections import deque
#import copy
#import math
#from functools import lru_cache
#@lru_cache(maxsize=None)
MOD = pow(10,9) + 7
#MOD = 998244353
#dx = [1,0,-1,0]
#dy = [0,1,0,-1]
#dx8 = [1,1,0,-1,-1,-1,0,1]
#dy8 = [0,1,1,1,0,-1,-1,-1]

# B = BIT([0]*M)
class BIT: #1-index
    def __init__(self,init_value):
        self.n = len(init_value)
        self.tree = [0]*(self.n+1)
        for i in range(1,self.n+1):
            x = init_value[i-1]
            while i <= self.n:
                self.tree[i] += x
                i += i & (-i)
 
    def add(self,i,x): 
        while i <= self.n:
            self.tree[i] += x
            i += i & (-i)
        return
 
    def to_sum(self,i):
        res = 0
        while i > 0:
            res += self.tree[i]
            i -= i & (-i)
        return res
 
    # get(i,i)でi番目を取得
    def get(self, i, j):
        return self.to_sum(j)-self.to_sum(i-1)

    def lower_bound(self,x):  # a_1+…+a_i >= x となる最小のi
        res = 0
        r = 1
        while r <= self.n:
            r <<= 1
        while r:
            if res+r <= self.n and self.tree[res+r] < x:
                x -= self.tree[res+r]
                res += r
            r >>= 1
        return res+1

def main():
    # N: 横, K: 壁の種類, Q: クエリ
    N,K,Q = map(int,input().split())
    wall_colors = [-1]*(N+1)
    # 何番目の壁で高さいくつが追加/消去されるか。
    wall_start = [[] for _ in range(N+2)]
    wall_end = [[] for _ in range(N+2)]
    for i in range(K):
        L,R,C,H = map(int,input().split())
        wall_start[L].append((i+1,H))
        wall_end[R+1].append((i+1,H))
        wall_colors[i+1] = C
    
    #print(wall_start)
    #print(wall_end)

    # queries[i]: i番目(1-index)の壁に対するクエリ
    queries = [[] for _ in range(N+1)]
    for i in range(Q):
        I,X = map(int,input().split())
        queries[I].append((i,X))
    
    ans = [-1]*Q

    # i番目(1-index)の壁の高さが今どうなっているか。
    Tree = BIT([0]*K)


    for x in range(1,N+1):
        # i番目(1-index)の壁が、H伸びる。
        for i,H in wall_start[x]:
            #print("start",i,H)
            Tree.add(i,H)
        # i番目(1-index)の壁が、H消える。
        for i,H in wall_end[x]:
            #print("end",i,H)
            Tree.add(i,-H)
        
        # デバッグ用
        # state = []
        # for i in range(1,K+1):
        #     state.append(Tree.get(i,i))
        #print(x,state)
        
        for idx, height in queries[x]:
            #print("zenbu",Tree.to_sum(K), height)
            if Tree.to_sum(K) < height:
                continue 
            ci = Tree.lower_bound(height)
            ans[idx] = wall_colors[ci]
    
    print(*ans,sep="\n")
        




if __name__ == '__main__':
    main()