console.time('solve')
console.log( solve('SEND+MORE=MONEY') )
console.timeEnd('solve')
 
 
 
function solve ( Q ) {
	const [A, X, B, , C] = Q.match(/[\w]+|./g)
	const chars = [...new Set(A+B+C)], fchars = new Set(A[0]+B[0]+C[0])
 
	let source = `(function(){\n`
	for ( let c of chars ) {
		source += `for(let ${c} = ${+fchars.has(c)}; ${c} <= 9; ${c}++) {\n`
		for ( let c2 of [...chars].splice( 0, chars.indexOf(c) ) ) {
			source += `  if (${c} == ${c2}) continue\n`
		}
	}
 
	source += `  if ( (0 `
	for ( let [i, c] of [...A].reverse().entries() ) {
		source += `+ ${c} * 10e${i}`
	}
	source += `) ${X} (0 `
	for ( let [i, c] of [...B].reverse().entries() ) {
		source += `+ ${c} * 10e${i}`
	}
	source += `) == (0 `
	for ( let [i, c] of [...C].reverse().entries() ) {
		source += `+ ${c} * 10e${i}`
	}
	source += `) ) return [${chars.join(',')}]\n`
 
	source += `${'}\n'.repeat( chars.length )}})()\n`
 
	const result = eval( source )
 
	return result && Q.replace(/[\w]/g, c => result[chars.indexOf(c)])
 
}

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