import std.algorithm;
import std.array;
import std.conv;
import std.math;
import std.range;
import std.stdio;
import std.string;
import std.typecons;

int readint() {
    return readln.chomp.to!int;
}

int[] readints() {
    return readln.split.map!(to!int).array;
}

void main() {
    auto xs = readln.chomp.split(':').map!(to!int).array;

    int x = xs[0] * 60 + xs[1];
    x = (x + 5) % (24 * 60);
    writefln("%02d:%02d", x / 60, x % 60);
}