#include<bits/stdc++.h> using namespace std; char s[100086]; int a[26]; int main() { cin>>s; int n = strlen(s); for(int j=0;j<n;j++){ for(int i=0;i<26;i++)if(s[j]==char('a'+i))a[i]; } for(int i=0;i<26;i)if(a[i]!=0)cout<<char('a'+i)<<':'<<a[i]<<endl; return 0; }

#include<bits/stdc++.h> using namespace std; int main(){ char a='a'; int sum=0; char s[105]; cin>>s; int len=strlen(s); for(int i=1;i<=26;i++){ sum=0; for(int j=0;j<len;j++){ if(s[j]==a){ sum++; } } if(sum!=0){ cout<<a<<":"<<sum<<endl; } a++; } return 0; }

from collections import defaultdict count_dict=defaultdict(int) s=input().strip() for char in s: count_dict[char]+=1 for char in sorted(count_dict): if count_dict[char]>0: print(f"{char}:{count_dict[char]}")