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import std.stdio;
import derelict.sdl2.sdl;
import derelict.sdl2.image;
import std.string;
import std.conv;
import std.exception;

static this()
{
    DerelictSDL2.load();
    DerelictSDL2Image.load();
}

void main()
{
    enforce(SDL_Init(SDL_INIT_VIDEO) >= 0);
    enforce(IMG_Init(IMG_INIT_PNG) & IMG_INIT_PNG);

    auto input = readln().chomp();
    auto img = IMG_Load(input.toStringz());
    if(img is null)
        writeln(IMG_GetError().to!string);

    auto bs = cast(ubyte*)(img.pixels);
    size_t bytes = bs[0] << 24 | bs[1] << 16 | bs[2] << 8 | bs[3];

    File file = File("output.dat", "w");
    file.rawWrite(img.pixels[4 .. bytes + 4]);
}