function main(input){
    let str = input.toLowerCase();
    let alp = "abcdefghijklmnopqrstuvwxyz";
    for(let i=0;i<alp.length;i++){
        let count = 0;
        for(let j =0;j<str.length;j++){
            let char = str[j];
            if(char===alp[i]){
                count++;

            }
        }
        console.log(alp[i]+" : "+count);
    }
    
}


main(require("fs").readFileSync("/dev/stdin","utf-8"));
