#include <stdio.h>
#include<string.h>

int main() {
    char a[100];
    int b[100];
    int m[100]={0};
    int x,y=0,z,h=0,o=0;
    fgets(a,100,stdin);
    for(int i=97;i<=122;i++)
    {
        b[i-97]=i;
    }
    m[0]=0;
    x=strlen(a);
    for(int t=0;t<x;t++)
    {
        for(int p=97;p<=122;p++)
            {
                if(a[t]==b[p-97])
                {
                    m[p-97]++;
                }
                
            }
    }
    for(int p=97;p<=122;p++)
        {
             printf("%c:%d\n",p,m[p-97]);
            y++;
        }
} 

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