const LON = +readline().replace(",", ".");
const LAT = +readline().replace(",", ".");
const N = parseInt(readline());
const defibNames = []
const allDistances = []

for (let i = 0; i < N; i++) {
    const DEFIB = readline();
    const data = DEFIB.split(";")
    defibNames.push(data[1])

    const defibLON = +data[data.length - 1].replace(",", ".")
    const defibLAT = +data[data.length - 2].replace(",", ".")

    const x = (LON - defibLON) * (Math.cos(defibLAT + LAT) / 2)
    const y = (LAT - defibLAT)
    const d = Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2)) * 6371

    allDistances.push(d)
}

console.log(defibNames[allDistances.indexOf(Math.min(...allDistances))]);

// Write an answer using console.log()
// To debug: console.error('Debug messages...');