#include <bits/stdc++.h>
using namespace std;
int main()
{
string s;
char c=97;
int n=26;
getline(cin, s);
while(n>0)
{
int i=0,cnt=0;
for(int i=0;i<s.length();i++)
{
s[i]=tolower(s[i]);
if(s[i]==c)
cnt++;
}
if(c==123)
cout<<c<<":"<<cnt;
else
cout<<c<<":"<<cnt<<"\n";
c++;
n--;
}
return 0;
}
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