use std::{io, iter, cmp::min};
use std::collections::{HashMap, HashSet, VecDeque};
use std::time::{SystemTime, UNIX_EPOCH};
 
type NodeID = (usize, usize);
 
fn main() {
    let mut input = String::new();
    io::stdin().read_line(&mut input).expect("Failed to read input");
 
    let startdata: Vec<usize> = input.split_whitespace().map(|e| e.parse::<usize>().unwrap()).collect();
 
    let mut grid: Vec<Vec<bool>> = vec!();
    let mut nodeset: Vec<NodeID> = Vec::new();
 
    for row in 0..startdata[0] {
        let mut newrow: Vec<bool> = vec!();
        let mut rowinput = String::new();
        io::stdin().read_line(&mut rowinput).expect("Failed to read input");
        let bytes = rowinput.as_bytes();
 
        for c in 0..rowinput.len() {
            if bytes[c] == 46 {
                newrow.push(true);
                nodeset.push((row, c));
            } else {
                newrow.push(false);
            }
        }
 
        /*for c in rowinput.into_bytes().into_iter() {
            if c == 46 {
                newrow.push(true);
                nodeset.push((row, ))
            } else {
                newrow.push(false);
            }
        } */
        grid.push(newrow);
    }
 
    let mut distancehash: HashMap<(NodeID, NodeID), isize> = HashMap::new();
 
    for node1 in nodeset.iter() {
        for node2 in nodeset.iter() {
            if node1 == node2 {
                distancehash.insert((*node1, *node2), 0);
            } else if node1.1 == node2.1 || node1.0 == node2.0 {
                distancehash.insert((*node1, *node2), 1);
            } else {
                distancehash.insert((*node1, *node2), 1000000);
            }
        }
    }
 
    for node1 in nodeset.iter() {
        for node2 in nodeset.iter() {
            for node3 in nodeset.iter() {
                let val1 = distancehash[&(*node2, *node3)];
                let val2 = distancehash[&(*node2, *node1)]+distancehash[&(*node1, *node3)];
                distancehash.insert((*node2, *node3), min(val1, val2));
            }
        }
    }
 
    for _q in 0..startdata[2] {
        let mut questioninput = String::new();
        io::stdin().read_line(&mut questioninput).expect("Failed to read input");
        let questiondata: Vec<usize> = questioninput.split_whitespace().map(|e| e.parse::<usize>().unwrap()-1).collect();
        let source = (questiondata[0], questiondata[1]);
        let destination = (questiondata[2], questiondata[3]);
 
        let dist = distancehash[&(source, destination)];
        if dist != 1000000 {
            println!("{}", dist);
        } else {
            println!("-1");
        }
    }
}