unittest
{
	assert( [ "100" ].parse.expand.solve == "ABC100" );
	assert( [ "425" ].parse.expand.solve == "ABC425" );
	assert( [ "999" ].parse.expand.solve == "ABC999" );
}



import std.conv;
import std.range;
import std.stdio;
import std.string;
import std.typecons;

void main()
{
	stdin.byLineCopy.parse.expand.solve.writeln;
}

auto parse( Range )( Range input )
if( isInputRange!Range && is( ElementType!Range == string ) )
{
	auto n = input.front.strip;
	return tuple( n );
}

auto solve( string n )
{
	return "ABC" ~ n;
}
