console.time('SEND+MORE==MONEY')
console.log( solve('SEND+MORE==MONEY') )
console.timeEnd('SEND+MORE==MONEY')
 
console.time('third+third+third+seven==eight')
console.log( solve('third+third+third+seven==eight') )
console.timeEnd('third+third+third+seven==eight')
 
 
 
function solve ( Q ) {
	const words = Q.match(/[\w]+/g), ops = Q.match(/[^\w]+/g)
	const chars = [...new Set(words.join(''))], fchars = new Set(words.map(w=>w[0]))
 
	let source = `(function(){\n`
	for ( let c of chars ) {
		source += `for (var ${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, w] of words.entries() ) {
		for ( let [j, c] of [...w].reverse().entries() ) {
			source += `+ ${c} * 10e${j}`
		}
		if ( i != words.length - 1 ) source += `) ${ops[i]} (0 `
	}
	source += `) ) return [${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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