#include <stdio.h>
#include <stdlib.h>
 
int myStrlen(char s[]){
    int i;
    for(i=0;s[i]!='\0';i++);
    return i;
}
 
int main(){
    int i, size;
 
    //tがバッファー、sに動的確保する
    char *s;
    char t[1024];
 
    scanf("%s",t);
 
    //tに入力して文字数を数える
    size = myStrlen(t);
 
    //intの時と同じように動的確保する
    //※大きさだけ注意、「+1」は終端文字の分
    s = (char *)malloc(sizeof(char)*(size+1));
 
    if(s == NULL){
        printf("ERROR\n");
        return 0;
    }
 
    //sのほうにtと終端文字を代入
    for(i=0;i<size;i++){
        s[i] = t[i];
    }
 
    s[size] = '\0';
    printf("%d : %s",size,s);
 
    free(s); //freeを忘れない
 
    return 0;
}
 

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