WA#5#7 80分 求调 代码：

#include<iostream>
#include<cstdio>
#include<algorithm>
using namespace std;
int a[10000001];
int main(){
    char c;
    int i=0;
    while(cin>>c){
        int b=c;
        a[b]++;
        i++;
    }
    for(int j=1;j<=i;++j)
        if(a[j]==1){
            char c1=j;
            cout<<c1;
            return 0;
        }
    cout<<"no";
    return 0;
}