题解 | #字符个数统计#
字符个数统计
http://www.nowcoder.com/practice/eb94f6a5b2ba49c6ac72d40b5ce95f50
const readline = require('readline')
var rl = readline.createInterface({
input:process.stdin,
output:process.stdout
})
var str = ''
rl.on('line',(line)=>{
str = line
})
rl.on('close',()=>{
var arr = str.split('')
var s = new Set(arr.reverse())
var arr2 = [...s]
console.log(arr2.length)
})
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