#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
int main(){
string str;
cin >> str;
int len = str.size();
int addr[128] = {0};
char first_s;//记录 第一个只出现一次的字符
for(int i = 0; i < len; i++)
{
addr[str[i]]++;
}
for(int i = 0; i < len; i++){
if(addr[str[i]] == 1)
{
first_s = str[i];
break;//跳出循环,避免重复赋值
}
}
if(first_s != NULL){
cout << first_s <<endl;
}
else{
cout << -1 <<endl;
}
return 0;
}
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
int main(){
string str;
cin >> str;
int len = str.size();
int addr[128] = {0};
char first_s;//记录 第一个只出现一次的字符
for(int i = 0; i < len; i++)
{
addr[str[i]]++;
}
for(int i = 0; i < len; i++){
if(addr[str[i]] == 1)
{
first_s = str[i];
break;//跳出循环,避免重复赋值
}
}
if(first_s != NULL){
cout << first_s <<endl;
}
else{
cout << -1 <<endl;
}
return 0;
}