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#!/usr/bin/env node
// run <script> <space-separated strings>
function canChain(words,start,end) {
if (words.length === 0) {return 0}
if (words.length === 1) {
return 0+(words[0].slice(0,1) === start && words[0].slice(-1) === end)
}
const startIdxs = words.map((el,ix) => ix).filter(ix => words[ix].slice(0,1) === start)
return 0+( startIdxs.map(ix => canChain(words.map((el,ix) => ix).filter(x => x !== ix).map( ix => words[ix] ), words[ix].slice(-1), end)).some(x => x) )
}
console.log((process.argv.length < 4) ? (0) : (canChain(process.argv.slice(3), process.argv[2].slice(-1), process.argv[2].slice(0,1))))
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