const input = ['3', '1', '9'];
const print = this.print || console.log;
const gets = this.gets || ((arr, index) => () => arr[index++])(input, 0);
const a = Number(gets());
const b = Number(gets());
const c = Number(gets());
if (a > 0 && b > 0 && c > 0) {
    console.log('+');
} else if (a < 0 && b < 0 && c < 0) {
    console.log('-');
} else if ((a < 0 && b < 0 && c > 0) || (a < 0 && b > 0 && c < 0) || (a > 0 && b < 0 && c < 0)) {
    console.log('+');
} else if ((a < 0 && b > 0 && c > 0) || (a > 0 && b < 0 && c > 0) || (a > 0 && b > 0 && c < 0)) {
    console.log('-');
} else if (a === 0 || b === 0 || c === 0) {
    console.log('0');
}