#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor() \max()\min() using namespace std; int main(){ int a,b=1,i=0,c; cin>>a; for(;c!=a;i++,b=b*10){ c=a%b; } cout<<i-1; return 0; }